| Common Name | Scientific Name | Code |
| n/a | Heuchera ?cuneata T.J. Howell (pro sp.) [cylindrica ? rubescens] | HECU8 |
| n/a | Mitella ?intermedia Bruhin ex Small & Rydb. (pro sp.) [diphylla ? nuda] | MIIN2 |
| n/a | Rodgersia Gray | RODGE |
| n/a | Rodgersia sambucifolia Hemsl. | ROSA6 |
| n/a | Saxifraga ?geum L. (pro sp.) [excluded] | SAGE4 |
| n/a | Saxifraga calycina Sternb. ssp. calycina Sternb. [excluded] | SACAC5 |
| n/a | Saxifraga calycina Sternb. [excluded] | SACA53 |
| n/a | Saxifraga hirsuta L. [excluded] | SAHI12 |
| Alaska grass of Parnassus | Parnassia palustris L. var. palustris | PAPAP |
| Alaska saxifrage | Saxifraga razshivinii Zhmylev | SARA7 |
| Alberta saxifrage | Saxifraga occidentalis S. Wats. | SAOC4 |
| Aleutian saxifrage | Saxifraga aleutica Hult | SAAL6 |
| Allegheny brookfoam | Boykinia aconitifolia Nutt. | BOAC |
| alpine alumroot | Heuchera cylindrica Dougl. ex Hook. var. alpina Sw. | HECYA |
| alpine heuchera | Heuchera glabra Willd. ex Roemer & J.A. Schultes | HEGL5 |
| alpine saxifrage | Saxifraga nivalis L. | SANI6 |
| alternate-leaf golden saxifrage | Chrysosplenium alternifolium L. | CHAL24 |
| alumroot | Heuchera L. | HEUCH |
| alumroot brookfoam | Telesonix heucheriformis Rydb. | TEHE5 |
| American alumroot | Heuchera americana L. | HEAM6 |
| American alumroot | Heuchera americana L. var. americana | HEAMA2 |
| American alumroot | Heuchera americana L. var. hirsuticaulis (Wheelock) Rosendahl, Butters & Lakela | HEAMH |
| American alumroot | Heuchera americana L. var. hispida (Pursh) E. Wells | HEAMH2 |
| American golden saxifrage | Chrysosplenium americanum Schwein. ex Hook. | CHAM2 |
| angleleaf miterwort | Mitella diversifolia Greene | MIDI4 |
| Appalachian false goat's beard | Astilbe biternata (Vent.) Britt. | ASBI4 |
| Arizona alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. arizonica Rosendahl, Butters & Lakela | HEPAA |
| Arkansas alumroot | Heuchera villosa Michx. var. arkansana (Rydb.) E.B. Sm. | HEVIA |
| beautiful alumroot | Heuchera cylindrica Dougl. ex Hook. var. glabella (Torr. & Gray) Wheelock | HECYG |
| bensoniella | Bensoniella Morton | BENSO |
| Bensoniella oregana | Bensonia oregona Abrams & Bacig. | BEOR2 |
| Bergenia crassifolia | Bergenia cordifolia (Haw.) Sternb. | BECO7 |
| bigflower tellima | Tellima grandiflora (Pursh) Dougl. ex Lindl. | TEGR2 |
| Bolander's woodland-star | Lithophragma bolanderi Gray | LIBO5 |
| Bolandra oregana | Bolandra oregana S. Wats. var. imnahaensis M.E. Peck | BOORI |
| Boykinia aconitifolia | Boykinia turbinata (Rydb.) Fedde | BOTU |
| Boykinia aconitifolia | Therofon aconitifolium (Nutt.) Millsp. | THAC2 |
| Boykinia aconitifolia | Therofon turbinatum Rydb. | THTU2 |
| Boykinia intermedia | Boykinia major Gray var. intermedia Piper | BOMAI |
| Boykinia occidentalis | Boykinia elata (Nutt.) Greene | BOEL2 |
| Boykinia occidentalis | Boykinia vancouverensis (Rydb.) Fedde | BOVA |
| Boykinia richardsonii | Saxifraga richardsonii Hook. | SARI7 |
| Boykinia richardsonii | Therofon richardsonii (Hook.) Kuntze | THRI2 |
| bract saxifrage | Saxifraga sibirica L. | SASI6 |
| bracted alumroot | Heuchera bracteata (Torr.) Ser. | HEBR2 |
| Brewer's miterwort | Mitella breweri Gray | MIBR6 |
| Bridger Mountain alumroot | Heuchera flabellifolia Rydb. | HEFL14 |
| Bridger Mountain alumroot | Heuchera flabellifolia Rydb. var. flabellifolia | HEFLF |
| Bridger Mountain alumroot | Heuchera flabellifolia Rydb. var. subsecta Rosendahl, Butters & Lakela | HEFLS |
| broadsepal saxifrage | Saxifraga platysepala (Trautv.) Tolm. | SAPL3 |
| brook saxifrage | Saxifraga odontoloma Piper | SAOD2 |
| brookfoam | Boykinia Nutt. | BOYKI |
| brookfoam | Telesonix Raf. | TELES2 |
| bud saxifrage | Saxifraga bryophora Gray | SABR7 |
| bud saxifrage | Saxifraga bryophora Gray var. bryophora | SABRB3 |
| bulbous woodland-star | Lithophragma glabrum Nutt. | LIGL2 |
| buttercup suksdorfia | Suksdorfia ranunculifolia (Hook.) Engl. | SURA |
| California grass of Parnassus | Parnassia californica (Gray) Greene | PACA18 |
| California saxifrage | Saxifraga californica Greene | SACA18 |
| Carolina alumroot | Heuchera caroliniana (Rosendahl, Butters & Lakela) E. Wells | HECA23 |
| Carolina grass of Parnassus | Parnassia caroliniana Michx. | PACA13 |
| Carolina saxifrage | Saxifraga caroliniana Gray | SACA20 |
| Chiricahua Mountain alumroot | Heuchera glomerulata Rosendahl, Butters & Lakela | HEGL6 |
| Chrysosplenium alternifolium var. sibiricum | Chrysosplenium alternifolium L. ssp. iowense (Rydb.) Hult | CHALI |
| Chrysosplenium alternifolium var. sibiricum | Chrysosplenium alternifolium L. var. iowense (Rydb.) Boivin | CHALI2 |
| Chrysosplenium alternifolium var. sibiricum | Chrysosplenium iowense Rydb. | CHIO |
| Chrysosplenium tetrandrum | Chrysosplenium alternifolium L. ssp. tetrandrum (Lund ex Malmgr.) Hult | CHALT |
| Chrysosplenium tetrandrum | Chrysosplenium alternifolium L. var. tetrandrum Lund ex Malmgr. | CHALT2 |
| Chrysosplenium wrightii var. beringianum | Chrysosplenium beringianum Rose | CHBE8 |
| ciliate saxifrage | Saxifraga eschscholtzii Sternb. | SAES |
| coastal brookfoam | Boykinia occidentalis Torr. & Gray | BOOC2 |
| coastal miterwort | Mitella ovalis Greene | MIOV |
| conimitella | Conimitella Rydb. | CONIM |
| coolwort | Sullivantia Torr. & Gray ex Gray | SULLI |
| coralbells | Elmera Rydb. | ELMER |
| coralbells | Heuchera sanguinea Engelm. | HESA3 |
| coralbells | Heuchera sanguinea Engelm. var. pulchra (Rydb.) Rosendahl | HESAP |
| coralbells | Heuchera sanguinea Engelm. var. sanguinea | HESAS |
| Crandall's saxifrage | Saxifraga flagellaris Willd. ex Sternb. ssp. crandallii (Gandog.) Hult | SAFLC |
| creeping bishop's cap | Mitella prostrata Michx. | MIPR2 |
| creeping saxifrage | Saxifraga stolonifera Meerb. | SAST6 |
| crevice alumroot | Heuchera micrantha Dougl. ex Lindl. | HEMI7 |
| crevice alumroot | Heuchera micrantha Dougl. ex Lindl. var. diversifolia (Rydb.) Rosendahl, Butters & Lakela | HEMID2 |
| crevice alumroot | Heuchera micrantha Dougl. ex Lindl. var. erubescens (A. Braun & Bouch?) Rosendahl | HEMIE2 |
| crevice alumroot | Heuchera micrantha Dougl. ex Lindl. var. macropetala B.G. Shipes & E. Wells | HEMIM4 |
| crevice alumroot | Heuchera micrantha Dougl. ex Lindl. var. micrantha | HEMIM2 |
| darmera | Darmera Voss | DARME |
| Darmera peltata | Peltiphyllum peltatum (Torr. ex Benth.) Engl. | PEPE2 |
| Darmera peltata | Saxifraga peltata Torr. ex Benth. | SAPE19 |
| diamondleaf saxifrage | Saxifraga rhomboidea Greene | SARH2 |
| downy alumroot | Heuchera pubescens Pursh | HEPU7 |
| drywoods miterwort | Mitella stauropetala Piper var. stenopetala (Piper) Rosendahl | MISTS |
| early saxifrage | Saxifraga virginiensis Michx. | SAVI5 |
| early saxifrage | Saxifraga virginiensis Michx. var. virginiensis | SAVIV |
| eastern swamp saxifrage | Saxifraga pensylvanica L. | SAPE8 |
| elephant-ear | Bergenia Moench | BERGE2 |
| Elmera racemosa var. racemosa | Heuchera racemosa S. Wats. | HERA6 |
| false coolwort | Bolandra Gray | BOLAN |
| false goat's beard | Astilbe Buch.-Ham. ex D. Don | ASTIL |
| fen grass of Parnassus | Parnassia glauca Raf. | PAGL3 |
| fireleaf leptarrhena | Leptarrhena pyrolifolia (D. Don) R. Br. ex Ser. | LEPY |
| fivestamen miterwort | Mitella pentandra Hook. | MIPE |
| florist's spiraea | Astilbe japonica (Morr. & Dcne.) Gray | ASJA2 |
| foamflower | Tiarella L. | TIARE |
| foothill jepsonia | Jepsonia heterandra Eastw. | JEHE |
| fringed grass of Parnassus | Parnassia fimbriata Koenig | PAFI3 |
| fringed grass of Parnassus | Parnassia fimbriata Koenig var. fimbriata | PAFIF |
| fringed grass of Parnassus | Parnassia fimbriata Koenig var. hoodiana C.L. Hitchc. | PAFIH |
| fringed grass of Parnassus | Parnassia fimbriata Koenig var. intermedia (Rydb.) C.L. Hitchc. | PAFII |
| Front Range alumroot | Heuchera hallii Gray | HEHA2 |
| Funston's saxifrage | Saxifraga bronchialis L. ssp. funstonii (Small) Hult | SABRF |
| goldbloom saxifrage | Saxifraga chrysantha Gray | SACH4 |
| golden eye saxifrage | Saxifraga careyana Gray | SACA19 |
| golden saxifrage | Chrysosplenium L. | CHRYS8 |
| gooseberryleaf alumroot | Heuchera grossulariifolia Rydb. | HEGR8 |
| gooseberryleaf alumroot | Heuchera grossulariifolia Rydb. var. grossulariifolia | HEGRG |
| gooseberryleaf alumroot | Heuchera grossulariifolia Rydb. var. tenuifolia (Wheelock) C.L. Hitchc. | HEGRT |
| Gorman's saxifrage | Saxifraga gormanii Suksdorf | SAGO2 |
| grass of Parnassus | Parnassia L. | PARNA |
| hairy alumroot | Heuchera villosa Michx. | HEVI2 |
| hairy alumroot | Heuchera villosa Michx. var. villosa | HEVIV2 |
| Hapeman's coolwort | Sullivantia hapemanii (Coult. & Fisher) Coult. | SUHA |
| Hapeman's coolwort | Sullivantia hapemanii (Coult. & Fisher) Coult. var. hapemanii | SUHAH |
| hard alumroot | Heuchera duranii Bacig. | HEDU3 |
| Hartweg's alumroot | Heuchera micrantha Dougl. ex Lindl. var. hartwegii (S. Wats. ex Wheelock) Rosendahl | HEMIH |
| heartleaf foamflower | Tiarella cordifolia L. | TICO |
| heartleaf foamflower | Tiarella cordifolia L. var. austrina Lakela | TICOA |
| heartleaf foamflower | Tiarella cordifolia L. var. collina Wherry | TICOC |
| heartleaf foamflower | Tiarella cordifolia L. var. cordifolia | TICOC2 |
| heartleaf saxifrage | Saxifraga nelsoniana D. Don | SANE3 |
| heartleaf saxifrage | Saxifraga nelsoniana D. Don ssp. carlottae (Calder & Savile) Hult | SANEC |
| heartleaf saxifrage | Saxifraga nelsoniana D. Don ssp. cascadensis (Calder & Savile) Hult | SANEC2 |
| heartleaf saxifrage | Saxifraga nelsoniana D. Don ssp. insularis (Hult?n) Hult | SANEI |
| heartleaf saxifrage | Saxifraga nelsoniana D. Don ssp. nelsoniana | SANEN |
| Heuchera americana var. americana | Heuchera americana L. var. brevipetala Rosendahl, Butters & Lakela | HEAMB |
| Heuchera americana var. americana | Heuchera americana L. var. calycosa (Small) Rosendahl, Butters & Lakela | HEAMC |
| Heuchera americana var. americana | Heuchera americana L. var. heteradenia Fern. | HEAMH3 |
| Heuchera americana var. americana | Heuchera americana L. var. subtruncata Fern. | HEAMS |
| Heuchera americana var. americana | Heuchera calycosa Small | HECA22 |
| Heuchera americana var. americana | Heuchera curtisii Torr. & Gray ex Gray | HECU4 |
| Heuchera americana var. americana | Heuchera curtisii Torr. & Gray ex Gray var. crenata Rydb. | HECUC |
| Heuchera americana var. americana | Heuchera lancipetala Rydb. | HELA18 |
| Heuchera americana var. hirsuticaulis | Heuchera americana L. var. interior Rosendahl, Butters & Lakela | HEAMI |
| Heuchera americana var. hirsuticaulis | Heuchera hirsuticaulis (Wheelock) Rydb. | HEHI3 |
| Heuchera americana var. hispida | Heuchera hispida Pursh | HEHI5 |
| Heuchera caespitosa | Heuchera cespitosa Eastw. [orthographic variant] | HECE2 |
| Heuchera caroliniana | Heuchera americana L. var. caroliniana Rosendahl, Butters & Lakela | HEAMC2 |
| Heuchera cylindrica var. alpina | Heuchera cylindrica Dougl. ex Hook. var. ovalifolia (Nutt. ex Torr. & Gray) Wheelock | HECYO2 |
| Heuchera cylindrica var. alpina | Heuchera ovalifolia Nutt. ex Torr. & Gray | HEOV |
| Heuchera cylindrica var. alpina | Heuchera ovalifolia Nutt. ex Torr. & Gray var. thompsonii Rosendahl, Butters & Lakela | HEOVT |
| Heuchera cylindrica var. cylindrica | Heuchera cylindrica Dougl. ex Hook. var. suksdorfii (Rydb.) Dorn | HECYS2 |
| Heuchera cylindrica var. cylindrica | Heuchera saxicola E. Nels. | HESA8 |
| Heuchera cylindrica var. cylindrica | Heuchera suksdorfii Rydb. | HESU9 |
| Heuchera cylindrica var. glabella | Heuchera glabella Torr. & Gray | HEGL13 |
| Heuchera cylindrica var. orbicularis | Heuchera ovalifolia Nutt. ex Torr. & Gray var. orbicularis Rosendahl, Butters & Lakela | HEOVO |
| Heuchera flabellifolia var. flabellifolia | Heuchera parvifolia Nutt. ex Torr. & Gray var. dissecta M.E. Jones | HEPAD |
| Heuchera grossulariifolia var. grossulariifolia | Heuchera cusickii Rosendahl, Butters & Lakela | HECU5 |
| Heuchera grossulariifolia var. tenuifolia | Heuchera tenuifolia (Wheelock) Rydb. | HETE23 |
| Heuchera longiflora | Heuchera aceroides Rydb. | HEAC6 |
| Heuchera longiflora | Heuchera longiflora Rydb. var. aceroides (Rydb.) Rosendahl, Butters & Lakela | HELOA |
| Heuchera longiflora | Heuchera scabra Rydb. | HESC5 |
| Heuchera merriamii | Heuchera pringlei Rydb. | HEPR4 |
| Heuchera micrantha var. diversifolia | Heuchera diversifolia Rydb. | HEDI7 |
| Heuchera micrantha var. diversifolia | Heuchera micrantha Dougl. ex Lindl. var. pacifica Rosendahl, Butters & Lakela | HEMIP |
| Heuchera parviflora var. parviflora | Heuchera parviflora Bartl. var. rugelii (Shuttlw.) Rosendahl, Butters & Lakela | HEPAR |
| Heuchera parviflora var. puberula | Heuchera puberula Mackenzie & Bush | HEPU9 |
| Heuchera parvifolia var. nivalis | Heuchera nivalis Rosendahl, Butters & Lakela | HENI5 |
| Heuchera parvifolia var. parvifolia | Heuchera missouriensis Rosendahl | HEMI8 |
| Heuchera pubescens | Heuchera pubescens Pursh var. brachyandra Rosendahl, Butters & Lakela | HEPUB |
| Heuchera richardsonii | Heuchera hispida auct. non Pursh [misapplied] | HEHI10 |
| Heuchera richardsonii | Heuchera richardsonii R. Br. var. affinis Rosendahl, Butters & Lakela | HERIA |
| Heuchera richardsonii | Heuchera richardsonii R. Br. var. grayana Rosendahl, Butters & Lakela | HERIG |
| Heuchera richardsonii | Heuchera richardsonii R. Br. var. hispidior Rosendahl, Butters & Lakela | HERIH |
| Heuchera rubescens var. alpicola | Heuchera rubescens Torr. var. pachypoda (Greene) Rosendahl, Butters & Lakela | HERUP |
| Heuchera rubescens var. versicolor | Heuchera leptomeria Greene | HELE |
| Heuchera rubescens var. versicolor | Heuchera leptomeria Greene var. peninsularis Rosendahl, Butters & Lakela | HELEP |
| Heuchera rubescens var. versicolor | Heuchera versicolor Greene | HEVE2 |
| Heuchera rubescens var. versicolor | Heuchera versicolor Greene var. leptomeria (Greene) Kearney & Peebles | HEVEL |
| Heuchera villosa var. arkansana | Heuchera arkansana Rydb. | HEAR12 |
| Heuchera villosa var. villosa | Heuchera crinita Rydb. | HECR8 |
| Heuchera villosa var. villosa | Heuchera macrorhiza Small | HEMA14 |
| Heuchera villosa var. villosa | Heuchera villosa Michx. var. intermedia Rosendahl, Butters & Lakela | HEVII |
| Heuchera villosa var. villosa | Heuchera villosa Michx. var. macrorhiza (Small) Rosendahl, Butters & Lakela | HEVIM |
| hillside woodland-star | Lithophragma heterophyllum (Hook. & Arn.) Torr. & Gray | LIHE |
| Howell's saxifrage | Saxifraga howellii Greene | SAHO4 |
| Hulten's saxifrage | Saxifraga lyallii Engl. ssp. hultenii (Calder & Savile) Calder & Taylor | SALYH |
| Idaho saxifrage | Saxifraga idahoensis Piper | SAID |
| Indian rhubarb | Darmera peltata (Torr. ex Benth.) Voss | DAPE |
| Iowa golden saxifrage | Chrysosplenium alternifolium L. var. sibiricum Seringe ex DC. | CHALS3 |
| island jepsonia | Jepsonia malvifolia (Greene) Small | JEMA |
| James's telesonix | Telesonix jamesii (Torr.) Raf. | TEJA |
| jepsonia | Jepsonia Small | JEPSO |
| Jill of the rocks | Heuchera maxima Greene | HEMA4 |
| kidneyleaf grass of Parnassus | Parnassia asarifolia Vent. | PAAS2 |
| Kotzebue's grass of Parnassus | Parnassia kotzebuei Cham. ex Spreng. | PAKO3 |
| Laguna Mountain alumroot | Heuchera brevistaminea Wiggins | HEBR3 |
| large boykinia | Boykinia major Gray | BOMA3 |
| largeleaf grass of Parnassus | Parnassia grandifolia DC. | PAGR |
| leafystem saxifrage | Saxifraga foliolosa R. Br. | SAFO4 |
| leptarrhena | Leptarrhena R. Br. | LEPTA |
| Leptarrhena pyrolifolia | Lepuropetalon amplexifolium (Sternb.) Ser. | LEAM2 |
| Leptarrhena pyrolifolia | Saxifraga amplexifolia Sternb. | SAAM13 |
| Leptarrhena pyrolifolia | Saxifraga calycina Sternb. ssp. unalaschcensis (Sternb.) Hult | SACAU2 |
| Leptarrhena pyrolifolia | Saxifraga davurica Willd. var. unalaschcensis (Sternb.) Engl. | SADAU |
| Leptarrhena pyrolifolia | Saxifraga pyrolifolia D. Don | SAPY4 |
| Leptarrhena pyrolifolia | Saxifraga unalaschcensis Sternb. | SAUN4 |
| lepuropetalon | Lepuropetalon Ell. | LEPUR |
| Lepuropetalon spathulatum | Pyxidanthera spathulata Muhl. | PYSP2 |
| lettuceleaf saxifrage | Saxifraga micranthidifolia (Haw.) Steud. | SAMI6 |
| Lithophragma affine ssp. mixtum | Lithophragma tripartitum Greene | LITR6 |
| Lithophragma bolanderi | Lithophragma scabrellum (Greene) Greene | LISC6 |
| Lithophragma bolanderi | Lithophragma scabrellum (Greene) Greene var. peirsonii Jepson | LISCP |
| Lithophragma campanulatum | Lithophragma heterophyllum (Hook. & Arn.) Torr. & Gray var. campanulatum (T.J. Howell) M.E. Peck | LIHEC |
| Lithophragma glabrum | Lithophragma bulbiferum Rydb. | LIBU2 |
| Lithophragma glabrum | Lithophragma glabrum Nutt. var. bulbiferum (Rydb.) Jepson | LIGLB |
| Lithophragma glabrum | Lithophragma glabrum Nutt. var. ramulosum (Suksdorf) Boivin | LIGLR |
| Lithophragma parviflorum var. trifoliatum | Lithophragma trifoliatum Eastw. | LITR2 |
| Lithophragma tenellum | Lithophragma australe Rydb. | LIAU8 |
| Lithophragma tenellum | Lithophragma brevilobum Rydb. | LIBR8 |
| Lithophragma tenellum | Lithophragma rupicola Greene | LIRU3 |
| Lithophragma tenellum | Lithophragma tenellum Nutt. var. thompsonii (Hoover) C.L. Hitchc. | LITET |
| littleflower alumroot | Heuchera parviflora Bartl. | HEPA10 |
| littleflower alumroot | Heuchera parviflora Bartl. var. parviflora | HEPAP4 |
| littleflower alumroot | Heuchera parviflora Bartl. var. puberula (Mackenzie & Bush) E. Wells | HEPAP5 |
| littleleaf alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray | HEPA11 |
| littleleaf alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. flavescens (Rydb.) Rosendahl, Butters & Lakela | HEPAF |
| littleleaf alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. major Rosendahl, Butters & Lakela | HEPAM |
| littleleaf alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. microcarpa Rosendahl, Butters & Lakela | HEPAM2 |
| littleleaf alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. nivalis (Rosendahl, Butters & Lakela) A.& D. L?ve & Kapoor | HEPAN |
| littleleaf alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. parvifolia | HEPAP6 |
| longflower alumroot | Heuchera longiflora Rydb. | HELO5 |
| manyflower saxifrage | Saxifraga redofskii M.F. Adams | SARE11 |
| marsh grass of Parnassus | Parnassia palustris L. | PAPA8 |
| marsh grass of Parnassus | Parnassia palustris L. var. tenuis Wahlenb. | PAPAT |
| Marshall's saxifrage | Saxifraga marshallii Greene | SAMA5 |
| matted saxifrage | Saxifraga bronchialis L. ssp. austromontana (Wieg.) Piper | SABRA2 |
| Merriam's alumroot | Heuchera merriamii Eastw. | HEME2 |
| Michaux's saxifrage | Saxifraga michauxii Britt. | SAMI5 |
| Mill Creek alumroot | Heuchera parishii Rydb. | HEPA9 |
| mission woodland-star | Lithophragma cymbalaria Torr. & Gray | LICY3 |
| Mitella breweri | Pectiantia breweri (Gray) Rydb. | PEBR20 |
| Mitella caulescens | Mitellastra caulescens (Nutt.) T.J. Howell | MICA10 |
| Mitella diphylla | Mitella oppositifolia Rydb. | MIOP |
| Mitella diversifolia | Ozomelis diversifolia (Greene) Rydb. | OZDI |
| Mitella ovalis | Pectiantia ovalis (Greene) Rydb. | PEOV5 |
| Mitella pentandra | Pectiantia pentandra (Hook.) Rydb. | PEPE16 |
| Mitella stauropetala var. stauropetala | Ozomelis stauropetala (Piper) Rydb. | OZST |
| Mitella stauropetala var. stenopetala | Mitella stenopetala Piper | MIST7 |
| Mitella trifida var. trifida | Ozomelis anomala (Piper) Rydb. | OZAN |
| Mitella trifida var. trifida | Ozomelis micrantha (Piper) Rydb. | OZMI |
| Mitella trifida var. trifida | Ozomelis trifida (Graham) Rydb. | OZTR |
| Mitella trifida var. violacea | Mitella violacea Rydb. | MIVI5 |
| miterwort | Mitella L. | MITEL |
| mountain grass of Parnassus | Parnassia palustris L. var. montanensis (Fern. & Rydb. ex Rydb.) C.L. Hitchc. | PAPAM2 |
| naked miterwort | Mitella nuda L. | MINU3 |
| nakedstem saxifrage | Saxifraga nudicaulis D. Don | SANU2 |
| New Mexico alumroot | Heuchera novomexicana Wheelock | HENO |
| Newcombe's saxifrage | Saxifraga ferruginea Graham var. newcombei Small | SAFEN |
| nodding saxifrage | Saxifraga cernua L. | SACE2 |
| northern false coolwort | Bolandra oregana S. Wats. | BOOR |
| northern golden saxifrage | Chrysosplenium tetrandrum (Lund ex Malmgr.) Th. Fries | CHTE3 |
| Nuttall's saxifrage | Saxifraga nuttallii Small | SANU3 |
| Oklahoma saxifrage | Saxifraga virginiensis Michx. var. subintegra Goodman | SAVIS |
| Olympic saxifrage | Saxifraga tischii Skelly | SATI3 |
| oneleaf foamflower | Tiarella trifoliata L. var. unifoliata (Hook.) Kurtz | TITRU |
| Oregon bensoniella | Bensoniella oregana (Abrams & Bacig.) Morton | BEOR |
| Oregon coolwort | Sullivantia oregana S. Wats. | SUOR |
| Oregon saxifrage | Saxifraga oregana T.J. Howell | SAOR2 |
| Ottertail Pass saxifrage | Saxifraga tenuis (Wahlenb.) H. Sm. ex Lindm. | SATE9 |
| Pacific golden saxifrage | Chrysosplenium glechomifolium Nutt. | CHGL5 |
| Pacific saxifrage | Saxifraga nelsoniana D. Don ssp. pacifica (Hult?n) Hult | SANEP |
| Palmer's saxifrage | Saxifraga palmeri Bush | SAPA13 |
| Parnassia californica | Parnassia palustris L. var. californica Gray | PAPAC |
| Parnassia caroliniana | Parnassia floridana Rydb. | PAFL9 |
| Parnassia fimbriata var. intermedia | Parnassia cirrata Piper var. intermedia (Rydb.) P. & N. Holmgren | PACII |
| Parnassia fimbriata var. intermedia | Parnassia intermedia Rydb. | PAIN9 |
| Parnassia glauca | Parnassia americana Muhl. | PAAM5 |
| Parnassia kotzebuei | Parnassia kotzebuei Cham. ex Spreng. var. pumila C.L. Hitchc. & Ownbey | PAKOP |
| Parnassia palustris var. montanensis | Parnassia montanensis Fern. & Rydb. ex Rydb. | PAMO12 |
| Parnassia palustris var. parviflora | Parnassia parviflora DC. | PAPA9 |
| Parnassia palustris var. tenuis | Parnassia multiseta (Ledeb.) Fern. | PAMU12 |
| Parnassia palustris var. tenuis | Parnassia palustris L. ssp. neogaea (Fern.) Hult | PAPAN2 |
| Parnassia palustris var. tenuis | Parnassia palustris L. var. neogaea Fern. | PAPAN |
| Parry's jepsonia | Jepsonia parryi (Torr.) Small | JEPA |
| peak saxifrage | Saxifraga nidifica Greene | SANI5 |
| peak saxifrage | Saxifraga nidifica Greene var. claytoniifolia (Canby ex Small) Elvander | SANIC2 |
| peak saxifrage | Saxifraga nidifica Greene var. nidifica | SANIN |
| petiteplant | Lepuropetalon spathulatum Ell. | LESP |
| pink alumroot | Heuchera rubescens Torr. | HERU |
| pink alumroot | Heuchera rubescens Torr. var. alpicola Jepson | HERUA |
| pink alumroot | Heuchera rubescens Torr. var. glandulosa Kellogg | HERUG |
| pink alumroot | Heuchera rubescens Torr. var. rubescens | HERUR2 |
| pink alumroot | Heuchera rubescens Torr. var. rydbergiana Rosendahl, Butters & Lakela | HERUR |
| pink alumroot | Heuchera rubescens Torr. var. truncata Rosendahl, Butters & Lakela | HERUT |
| pink alumroot | Heuchera rubescens Torr. var. versicolor (Greene) M.G. Stewart | HERUV |
| poker alumroot | Heuchera cylindrica Dougl. ex Hook. var. orbicularis (Rosendahl, Butters & Lakela) Calder & Savile | HECYO |
| Porsild's saxifrage | Saxifraga nelsoniana D. Don ssp. porsildiana (Calder & Savile) Hult | SANEP2 |
| prairie woodland-star | Lithophragma parviflorum (Hook.) Nutt. ex Torr. & Gray var. trifoliatum (Eastw.) Jepson | LIPAT |
| purple mountain saxifrage | Saxifraga oppositifolia L. | SAOP |
| purple mountain saxifrage | Saxifraga oppositifolia L. ssp. glandulisepala Hult | SAOPG |
| purple mountain saxifrage | Saxifraga oppositifolia L. ssp. oppositifolia | SAOPO |
| purple mountain saxifrage | Saxifraga oppositifolia L. ssp. smalliana (Engl. & Irmsch.) Hult | SAOPS |
| Purpus's sullivantia | Sullivantia hapemanii (Coult. & Fisher) Coult. var. purpusii (Brand) Soltis | SUHAP |
| pygmy saxifrage | Saxifraga hyperborea R. Br. | SAHY |
| redfuzz saxifrage | Saxifraga eriophora S. Wats. | SAER3 |
| redhair saxifrage | Saxifraga rufopilosa (Hult?n) Porsild | SARU8 |
| redstem saxifrage | Saxifraga lyallii Engl. | SALY3 |
| redstem saxifrage | Saxifraga lyallii Engl. ssp. lyallii | SALYL |
| reflexed saxifrage | Saxifraga reflexa Hook. | SARE8 |
| Richardson's alumroot | Heuchera richardsonii R. Br. | HERI |
| Richardson's brookfoam | Boykinia richardsonii (Hook.) Rothrock | BORI2 |
| Roan Mountain false goat's beard | Astilbe crenatiloba (Britt.) Small | ASCR7 |
| roundleaf alumroot | Heuchera cylindrica Dougl. ex Hook. | HECY2 |
| roundleaf alumroot | Heuchera cylindrica Dougl. ex Hook. var. cylindrica | HECYC |
| roundleaf alumroot | Heuchera cylindrica Dougl. ex Hook. var. septentrionalis Rosendahl, Butters & Lakela | HECYS |
| roundleaf brookfoam | Boykinia rotundifolia Parry | BORO3 |
| russethair saxifrage | Saxifraga ferruginea Graham | SAFE |
| russethair saxifrage | Saxifraga ferruginea Graham var. ferruginea | SAFEF |
| rustyhair saxifrage | Saxifraga rufidula (Small) Macoun | SARU7 |
| Saddle Mountain saxifrage | Saxifraga hitchcockiana Elvander | SAHI7 |
| San Bernardino grass of Parnassus | Parnassia cirrata Piper | PACI2 |
| San Bernardino Mountain alumroot | Heuchera alpestris Rosendahl, Butters & Lakela | HEAL4 |
| San Clemente Island woodland-star | Lithophragma maximum Bacig. | LIMA6 |
| San Francisco woodland-star | Lithophragma affine Gray | LIAF |
| San Francisco woodland-star | Lithophragma affine Gray ssp. affine | LIAFA |
| San Francisco woodland-star | Lithophragma affine Gray ssp. mixtum R.L. Taylor | LIAFM |
| San Gabriel alumroot | Heuchera abramsii Rydb. | HEAB |
| Sandia Mountain alumroot | Heuchera pulchella Woot. & Standl. | HEPU10 |
| Saxifraga ?geum | Micranthes geum (L.) Small [excluded] | MIGE6 |
| Saxifraga adscendens ssp. oregonensis | Muscaria adscendens (L.) Small p.p. | MUAD |
| Saxifraga adscendens ssp. oregonensis | Saxifraga adscendens L. var. oregonensis (Raf.) Breitung | SAADO |
| Saxifraga aizoides | Leptasea aizoides (L.) Haw. | LEAI |
| Saxifraga apetala | Saxifraga columbiana Piper var. apetala (Piper) Engl. & Irmsch. | SACOA2 |
| Saxifraga apetala | Saxifraga integrifolia Hook. var. apetala (Piper) M.E. Jones | SAINA2 |
| Saxifraga aprica | Saxifraga laevicaulis A.M. Johnson | SALA12 |
| Saxifraga aprica | Saxifraga umbellulata sensu Greene, non Hook. & Thomas | SAUM2 |
| Saxifraga bronchialis ssp. austromontana | Ciliaria austromontana (Wieg.) W.A. Weber | CIAU3 |
| Saxifraga bronchialis ssp. austromontana | Saxifraga austromontana Wieg. | SAAU7 |
| Saxifraga bronchialis ssp. austromontana | Saxifraga bronchialis L. var. austromontana (Wieg.) Piper ex G.N. Jones | SABRA |
| Saxifraga bronchialis ssp. cherlerioides | Saxifraga bronchialis L. var. cherlerioides (D. Don) Engl. | SABRC2 |
| Saxifraga bronchialis ssp. cherlerioides | Saxifraga cherlerioides D. Don | SACH10 |
| Saxifraga bronchialis ssp. codyanus | Saxifraga codyanus Zhmylev | SACO33 |
| Saxifraga bronchialis ssp. funstonii | Ciliaria funstonii (Small) W.A. Weber | CIFU |
| Saxifraga bronchialis ssp. funstonii | Saxifraga bronchialis L. var. purpureomaculata Hult | SABRP3 |
| Saxifraga bronchialis ssp. funstonii | Saxifraga firma Litv. ex Losinsk. | SAFI |
| Saxifraga bronchialis ssp. funstonii | Saxifraga funstonii (Small) Fedde | SAFU4 |
| Saxifraga bronchialis ssp. vespertina | Ciliaria vespertina (Small) W.A. Weber | CIVE4 |
| Saxifraga bronchialis ssp. vespertina | Saxifraga bronchialis L. var. vespertina (Small) Rosendahl | SABRV |
| Saxifraga bronchialis ssp. vespertina | Saxifraga vespertina (Small) Fedde | SAVE9 |
| Saxifraga caespitosa | Saxifraga cespitosa L. [orthographic variant] | SACE4 |
| Saxifraga caespitosa ssp. caespitosa | Muscaria caespitosa (L.) Haw. | MUCA6 |
| Saxifraga caespitosa ssp. caespitosa | Muscaria cespitosa (L.) Haw. [orthographic variant] | MUCE |
| Saxifraga caespitosa ssp. caespitosa | Saxifraga caespitosa L. ssp. eucaespitosa Engl. & Irmsch. | SACAE2 |
| Saxifraga caespitosa ssp. caespitosa | Saxifraga caespitosa L. var. emarginata (Small) Rosendahl | SACAE |
| Saxifraga caespitosa ssp. caespitosa | Saxifraga caespitosa L. var. lemmonii Engl. & Irmsch. | SACAL4 |
| Saxifraga caespitosa ssp. caespitosa | Saxifraga cespitosa L. ssp. cespitosa L. [orthographic variant] | SACEC2 |
| Saxifraga caespitosa ssp. caespitosa | Saxifraga cespitosa L. ssp. eucaespitosa Engl. & Irmsch. [orthographic variant] | SACEE5 |
| Saxifraga caespitosa ssp. caespitosa | Saxifraga cespitosa L. var. lemmonii Engl. & Irmsch. [orthographic variant] | SACEL |
| Saxifraga caespitosa ssp. delicatula | Muscaria delicatula Small | MUDE4 |
| Saxifraga caespitosa ssp. delicatula | Saxifraga cespitosa L. ssp. delicatula (Small) Porsild [orthographic variant] | SACED |
| Saxifraga caespitosa ssp. monticola | Muscaria micropetala Small | MUMI3 |
| Saxifraga caespitosa ssp. monticola | Muscaria monticola Small | MUMO3 |
| Saxifraga caespitosa ssp. monticola | Saxifraga caespitosa L. var. minima Blank. | SACAM3 |
| Saxifraga caespitosa ssp. monticola | Saxifraga cespitosa L. ssp. monticola (Small) Porsild [orthographic variant] | SACEM2 |
| Saxifraga caespitosa ssp. monticola | Saxifraga cespitosa L. var. minima Blank. [orthographic variant] | SACEM |
| Saxifraga caespitosa ssp. monticola | Saxifraga micropetala (Small) Fedde | SAMI19 |
| Saxifraga caespitosa ssp. monticola | Saxifraga monticola (Small) A.& D. L?ve | SAMO11 |
| Saxifraga caespitosa ssp. sileneflora | Saxifraga cespitosa L. ssp. sileneflora (Sternb. ex Cham.) Hult?n [orthographic variant] | SACES2 |
| Saxifraga caespitosa ssp. sileneflora | Saxifraga sileneflora Sternb. ex Cham. | SASI9 |
| Saxifraga caespitosa ssp. subgemmifera | Saxifraga caespitosa L. var. subgemmifera (Engl. & Irmsch.) C.L. Hitchc. | SACAS3 |
| Saxifraga caespitosa ssp. subgemmifera | Saxifraga cespitosa L. ssp. subgemmifera Engl. & Irmsch. [orthographic variant] | SACES3 |
| Saxifraga caespitosa ssp. subgemmifera | Saxifraga cespitosa L. var. subgemmifera (Engl. & Irmsch.) C.L. Hitchc. | SACES |
| Saxifraga caespitosa ssp. uniflora | Saxifraga cespitosa L. ssp. uniflora (R. Br.) Porsild [orthographic variant] | SACEU |
| Saxifraga californica | Saxifraga fallax Greene | SAFA8 |
| Saxifraga californica | Saxifraga gracillima A.M. Johnson | SAGR16 |
| Saxifraga californica | Saxifraga hallii Gray | SAHA5 |
| Saxifraga californica | Saxifraga napensis Small | SANA3 |
| Saxifraga californica | Saxifraga parvifolia Greene | SAPA21 |
| Saxifraga californica | Saxifraga virginiensis Michx. var. californica (Greene) Jepson | SAVIC |
| Saxifraga careyana | Micranthes careyana (Gray) Small | MICA13 |
| Saxifraga careyana | Micranthes tennesseensis Small | MITE3 |
| Saxifraga caroliniana | Micranthes caroliniana (Gray) Small | MICA11 |
| Saxifraga cernua | Saxifraga cernua L. var. exilioides Polunin | SACEE4 |
| Saxifraga chrysantha | Hirculus serpyllifolius (Pursh) W.A. Weber ssp. chrysanthus (Gray) W.A. Weber | HISEC |
| Saxifraga chrysantha | Saxifraga serpyllifolia Pursh ssp. chrysantha (Gray) W.A. Weber | SASEC |
| Saxifraga chrysantha | Saxifraga serpyllifolia Pursh var. chrysantha (Gray) Dorn | SASEC2 |
| Saxifraga ferruginea var. vreelandii | Saxifraga ferruginea Graham var. foliacea A.M. Johnson | SAFEF2 |
| Saxifraga ferruginea var. vreelandii | Saxifraga ferruginea Graham var. macounii Engl. & Irmsch. | SAFEM |
| Saxifraga ferruginea var. vreelandii | Saxifraga vreelandii (Small) Fedde ex Just | SAVR2 |
| Saxifraga flagellaris ssp. crandallii | Hirculus platysepalus (Trautv.) W.A. Weber ssp. crandallii (Gandog.) W.A. Weber | HIPLC |
| Saxifraga flagellaris ssp. crandallii | Saxifraga crandallii Gandog. | SACR8 |
| Saxifraga flagellaris ssp. crandallii | Saxifraga flagellaris Willd. ex Sternb. var. crandallii (Gandog.) Dorn | SAFLC3 |
| Saxifraga flagellaris ssp. setigera | Saxifraga setigera Pursh | SASE13 |
| Saxifraga foliolosa | Hydatica foliolosa (R. Br.) Small | HYFO2 |
| Saxifraga foliolosa | Saxifraga stellaris L. var. comosa Poir. | SASTC |
| Saxifraga foliolosa | Spatularia foliolosa (R. Br.) Small | SPFO3 |
| Saxifraga gormanii | Saxifraga occidentalis S. Wats. var. dentata (Engl. & Irmsch.) C.L. Hitchc. | SAOCD |
| Saxifraga hirculus ssp. hirculus | Leptasea hirculus (L.) Small | LEHI6 |
| Saxifraga hirculus ssp. hirculus | Saxifraga hirculus L. ssp. coloradensis K.O. Hedb. | SAHIC |
| Saxifraga hirculus ssp. propinqua | Hirculus prorepens (Fisch. ex Sternb.) A.& D. L?ve | HIPR5 |
| Saxifraga hirculus ssp. propinqua | Saxifraga hirculus L. var. propinqua (R. Br.) Simm. | SAHIP |
| Saxifraga hirculus ssp. propinqua | Saxifraga prorepens Fisch. ex Sternb. | SAPR9 |
| Saxifraga hitchcockiana | Saxifraga occidentalis S. Wats. var. latipetiolata C.L. Hitchc. | SAOCL |
| Saxifraga hyperborea | Saxifraga rivularis L. var. hyperborea (R. Br.) Dorn | SARIH |
| Saxifraga idahoensis | Saxifraga marshallii Greene ssp. idahoensis (Piper) Krause & Beamish | SAMAI |
| Saxifraga idahoensis | Saxifraga marshallii Greene var. idahoensis (Piper) Engl. & Irmsch. | SAMAI2 |
| Saxifraga idahoensis | Saxifraga occidentalis S. Wats. var. idahoensis (Piper) C.L. Hitchc. | SAOCI |
| Saxifraga integrifolia | Micranthes bidens Small | MIBI11 |
| Saxifraga integrifolia | Saxifraga bracteosa Suksdorf | SABR14 |
| Saxifraga integrifolia | Saxifraga bracteosa Suksdorf var. angustifolia Suksdorf | SABRA5 |
| Saxifraga integrifolia | Saxifraga fragosa Suksdorf var. leucandra Suksdorf | SAFRL3 |
| Saxifraga integrifolia | Saxifraga laevicarpa A.M. Johnson | SALA16 |
| Saxifraga lyallii ssp. hultenii | Saxifraga lyallii Engl. var. hultenii Calder & Savile | SALYH2 |
| Saxifraga lyallii ssp. lyallii | Micranthes lyallii (Engl.) Small | MILY2 |
| Saxifraga lyallii ssp. lyallii | Saxifraga lyallii Engl. var. laxa Engl. | SALYL2 |
| Saxifraga mertensiana | Saxifraga mertensiana Bong. var. eastwoodiae (Small) Engl. & Irmsch. | SAMEE |
| Saxifraga michauxii | Hydatica petiolaris (Raf.) Small | HYPE7 |
| Saxifraga michauxii | Spathularia michauxii (Britt.) Small | SPMI5 |
| Saxifraga micranthidifolia | Micranthes micranthidifolia (Haw.) Small | MIMI7 |
| Saxifraga nelsoniana ssp. carlottae | Saxifraga punctata L. ssp. carlottae Calder & Savile | SAPUC2 |
| Saxifraga nelsoniana ssp. carlottae | Saxifraga punctata L. var. carlottae (Calder & Savile) Boivin | SAPUC5 |
| Saxifraga nelsoniana ssp. cascadensis | Saxifraga punctata L. ssp. cascadensis Calder & Savile | SAPUC4 |
| Saxifraga nelsoniana ssp. cascadensis | Saxifraga punctata L. var. cascadensis (Calder & Savile) Boivin | SAPUC |
| Saxifraga nelsoniana ssp. insularis | Saxifraga insularis (Hult?n) Hult | SAIN7 |
| Saxifraga nelsoniana ssp. insularis | Saxifraga punctata L. ssp. insularis Hult | SAPUI |
| Saxifraga nelsoniana ssp. nelsoniana | Saxifraga aestivalis Fisch. & C.A. Mey. | SAAE5 |
| Saxifraga nelsoniana ssp. nelsoniana | Saxifraga punctata L. p.p. | SAPU6 |
| Saxifraga nelsoniana ssp. nelsoniana | Saxifraga punctata L. ssp. nelsoniana (D. Don) Hult | SAPUN |
| Saxifraga nelsoniana ssp. nelsoniana | Saxifraga punctata L. var. nelsoniana (D. Don) Macoun | SAPUN2 |
| Saxifraga nelsoniana ssp. pacifica | Saxifraga punctata L. ssp. pacifica Hult | SAPUP |
| Saxifraga nelsoniana ssp. porsildiana | Saxifraga porsildiana (Calder & Savile) Jurtzev & Petrovsky | SAPO5 |
| Saxifraga nelsoniana ssp. porsildiana | Saxifraga punctata L. ssp. porsildiana Calder & Savile | SAPUP2 |
| Saxifraga nelsoniana ssp. porsildiana | Saxifraga punctata L. var. porsildiana (Calder & Savile) Boivin | SAPUP5 |
| Saxifraga nidifica var. claytoniifolia | Saxifraga claytoniifolia Canby ex Small | SACL4 |
| Saxifraga nidifica var. claytoniifolia | Saxifraga fragosa Suksdorf ex Small | SAFR7 |
| Saxifraga nidifica var. claytoniifolia | Saxifraga fragosa Suksdorf ex Small ssp. claytoniifolia (Canby ex Small) Bacig. | SAFRC |
| Saxifraga nidifica var. claytoniifolia | Saxifraga integrifolia Hook. var. claytoniifolia (Canby ex Small) Rosendahl | SAINC |
| Saxifraga nidifica var. nidifica | Micranthes montana Small | MIMO4 |
| Saxifraga nidifica var. nidifica | Saxifraga bracteosa Suksdorf var. micropetala Suksdorf | SABRM2 |
| Saxifraga nidifica var. nidifica | Saxifraga columbiana Piper | SACO23 |
| Saxifraga nidifica var. nidifica | Saxifraga crenatifolia (Small) Fedde | SACR7 |
| Saxifraga nidifica var. nidifica | Saxifraga integrifolia Hook. var. columbiana (Piper) C.L. Hitchc. | SAINC2 |
| Saxifraga nidifica var. nidifica | Saxifraga integrifolia Hook. var. leptopetala (Suksdorf) Engl. & Irmsch. | SAINL2 |
| Saxifraga nidifica var. nidifica | Saxifraga integrifolia Hook. var. micropetala (Suksdorf) Engl. & Irmsch. | SAINM |
| Saxifraga nidifica var. nidifica | Saxifraga montana (Small) Fedde | SAMO14 |
| Saxifraga nidifica var. nidifica | Saxifraga plantaginea Small | SAPL4 |
| Saxifraga nivalis | Micranthes nivalis (L.) Small | MINI4 |
| Saxifraga occidentalis | Micranthes lata Small | MILA11 |
| Saxifraga occidentalis | Micranthes occidentalis (S. Wats.) Small | MIOC |
| Saxifraga occidentalis | Micranthes saximontana (E. Nels.) Small | MISA2 |
| Saxifraga occidentalis | Saxifraga occidentalis S. Wats. var. allenii (Small) C.L. Hitchc. | SAOCA |
| Saxifraga occidentalis | Saxifraga occidentalis S. Wats. var. wallowensis M.E. Peck | SAOCW |
| Saxifraga occidentalis | Saxifraga reflexa Hook. ssp. occidentalis (S. Wats.) Hult | SAREO2 |
| Saxifraga odontoloma | Micranthes odontoloma (Piper) W.A. Weber | MIOD2 |
| Saxifraga odontoloma | Saxifraga aestivalis auct. p.p., non Fisch. & C.A. Mey. | SAAE4 |
| Saxifraga odontoloma | Saxifraga arguta auct. non D. Don [misapplied] | SAAR13 |
| Saxifraga odontoloma | Saxifraga punctata L. ssp. arguta auct. non (D. Don) Hult?n [misapplied] | SAPUA2 |
| Saxifraga odontoloma | Saxifraga punctata L. var. arguta sensu Engl. & Irmsch. | SAPUA3 |
| Saxifraga oppositifolia ssp. oppositifolia | Antiphylla oppositifolia (L.) Fourr. | ANOP |
| Saxifraga oregana | Micranthes arnoglossa Small | MIAR5 |
| Saxifraga oregana | Micranthes brachypus Small | MIBR10 |
| Saxifraga oregana | Micranthes oregana (T.J. Howell) Small | MIOR2 |
| Saxifraga oregana | Saxifraga montanensis Small | SAMO12 |
| Saxifraga oregana | Saxifraga oregana T.J. Howell var. montanensis (Small) C.L. Hitchc. | SAORM |
| Saxifraga oregana | Saxifraga oregana T.J. Howell var. sierrae Coville | SAORS |
| Saxifraga paniculata ssp. neogaea | Chondrosea paniculata P. Mill. ssp. neogaea (Butters) A. L?ve | CHPAN3 |
| Saxifraga paniculata ssp. neogaea | Saxifraga aizoon Jacq. ssp. neogaea (Butters) A.& D. L?ve | SAAIN |
| Saxifraga paniculata ssp. neogaea | Saxifraga aizoon Jacq. var. neogaea Butters | SAAIN2 |
| Saxifraga pensylvanica | Micranthes pensylvanica (L.) Haw. | MIPE4 |
| Saxifraga pensylvanica | Saxifraga forbesii Vasey | SAFO2 |
| Saxifraga pensylvanica | Saxifraga pensylvanica L. ssp. interior Burns | SAPEI |
| Saxifraga pensylvanica | Saxifraga pensylvanica L. ssp. tenuirostrata Burns | SAPET |
| Saxifraga pensylvanica | Saxifraga pensylvanica L. var. forbesii (Vasey) Engl. & Irmsch. | SAPEF |
| Saxifraga pensylvanica | Saxifraga pensylvanica L. var. purpuripetala (A.M. Johnson) Bush | SAPEP |
| Saxifraga platysepala | Hirculus platysepalus (Trautv.) W.A. Weber | HIPL3 |
| Saxifraga platysepala | Saxifraga flagellaris Willd. ex Sternb. ssp. platysepala (Trautv.) Porsild | SAFLP |
| Saxifraga platysepala | Saxifraga flagellaris Willd. ex Sternb. var. platysepala Trautv. | SAFLP2 |
| Saxifraga razshivinii | Saxifraga davurica Willd. ssp. grandipetala (Engl. & Irmsch.) Hult | SADAG |
| Saxifraga razshivinii | Saxifraga davurica Willd. var. grandipetala (Engl. & Irmsch.) Boivin | SADAG2 |
| Saxifraga redofskii | Saxifraga foliolosa R. Br. var. multiflora Hult | SAFOM |
| Saxifraga rhomboidea | Micranthes franciscana Small | MIFR6 |
| Saxifraga rhomboidea | Micranthes rhomboidea (Greene) Small | MIRH |
| Saxifraga rhomboidea | Saxifraga austrina (A. Nels.) A. Nels. | SAAU6 |
| Saxifraga rhomboidea | Saxifraga greenei Blank. | SAGR15 |
| Saxifraga rhomboidea | Saxifraga integrifolia Hook. var. rhomboidea (Greene) M.E. Jones | SAINR |
| Saxifraga rhomboidea | Saxifraga rhomboidea Greene var. austrina A. Nels. | SARHA |
| Saxifraga rhomboidea | Saxifraga rhomboidea Greene var. franciscana (Small) Kearney & Peebles | SARHF |
| Saxifraga rivularis | Saxifraga debilis Engelm. ex Gray | SADE4 |
| Saxifraga rivularis | Saxifraga hyperborea R. Br. ssp. debilis (Engelm. ex Gray) A.& D. L?ve & Kapoor | SAHYD |
| Saxifraga rivularis | Saxifraga rivularis L. ssp. flexuosa (Sternb.) Gjaerev. | SARIF2 |
| Saxifraga rivularis | Saxifraga rivularis L. var. debilis (Engelm. ex Gray) Dorn | SARID |
| Saxifraga rivularis | Saxifraga rivularis L. var. flexuosa (Sternb.) Engl. & Irmsch. | SARIF |
| Saxifraga rufidula | Saxifraga aequidentata (Small) Rosendahl | SAAE3 |
| Saxifraga rufidula | Saxifraga klickitatensis A.M. Johnson | SAKL |
| Saxifraga rufidula | Saxifraga occidentalis S. Wats. ssp. rufidula (Small) Bacig. | SAOCR |
| Saxifraga rufidula | Saxifraga occidentalis S. Wats. var. aequidentata (Small) M.E. Peck | SAOCA2 |
| Saxifraga rufidula | Saxifraga occidentalis S. Wats. var. rufidula (Small) C.L. Hitchc. | SAOCR2 |
| Saxifraga rufopilosa | Saxifraga nivalis L. var. rufopilosa Hult | SANIR |
| Saxifraga serpyllifolia | Hirculus serpyllifolius (Pursh) W.A. Weber | HISE2 |
| Saxifraga serpyllifolia | Saxifraga serpyllifolia Pursh var. purpurea Hult | SASEP |
| Saxifraga sibirica | Saxifraga bracteata D. Don | SABR5 |
| Saxifraga sibirica | Saxifraga exilis Steph. | SAEX2 |
| Saxifraga sibirica | Saxifraga radiata Small | SARA5 |
| Saxifraga sibirica | Saxifraga rivularis L. var. laurentiana (Ser.) Engl. | SARIL2 |
| Saxifraga stolonifera | Saxifraga sarmentosa L. | SASA6 |
| Saxifraga subapetala | Saxifraga hieraciifolia Waldst. & Kit. ex Willd. var. rydbergii (Small) Engl. & Irmsch. | SAHIR2 |
| Saxifraga subapetala | Saxifraga montanensis Small var. subpetala (E. Nels.) Engl. & Irmsch. | SAMOS |
| Saxifraga subapetala | Saxifraga oregana T.J. Howell var. subpetala (E. Nels.) C.L. Hitchc. | SAORS2 |
| Saxifraga subapetala | Saxifraga rydbergii Small | SARY2 |
| Saxifraga tenuis | Saxifraga nivalis L. var. tenuis Wahlenb. | SANIT |
| Saxifraga texana | Micranthes texana (Buckl.) Small | MITE7 |
| Saxifraga texana | Saxifraga reevesii Cory | SARE23 |
| Saxifraga tolmiei | Saxifraga tolmiei Torr. & Gray var. ledifolia (Greene) Engl. & Irmsch. | SATOL |
| Saxifraga tricuspidata | Leptasea tricuspidata (Rottb.) Haw. | LETR6 |
| Saxifraga virginiensis var. virginiensis | Micranthes virginiensis (Michx.) Small | MIVI7 |
| saxifrage | Saxifraga L. | SAXIF |
| saxifragopsis | Saxifragopsis Small | SAXIF2 |
| Saxifragopsis fragarioides | Saxifraga fragarioides Greene | SAFR2 |
| seaside alumroot | Heuchera pilosissima Fisch. & C.A. Mey. | HEPI3 |
| seaside alumroot | Heuchera pilosissima Fisch. & C.A. Mey. var. hemisphaerica (Rydb.) Rosendahl | HEPIH |
| seaside alumroot | Heuchera pilosissima Fisch. & C.A. Mey. var. pilosissima | HEPIP |
| Senator Mine alumroot | Heuchera eastwoodiae Rosendahl, Butters & Lakela | HEEA |
| shaggyhair alumroot | Heuchera hirsutissima Rosendahl, Butters & Lakela | HEHI4 |
| Siberian-tea | Bergenia crassifolia (L.) Fritsch | BECR3 |
| Sierra brookfoam | Boykinia intermedia (Piper) G.N. Jones | BOIN4 |
| Sierra false coolwort | Bolandra californica Gray | BOCA |
| Sierra saxifrage | Saxifraga aprica Greene | SAAP3 |
| Siskiyou Mountain woodland-star | Lithophragma campanulatum T.J. Howell | LICA21 |
| slender woodland-star | Lithophragma tenellum Nutt. | LITE4 |
| slightstemmed miterwort | Mitella caulescens Nutt. | MICA5 |
| small saxifrage | Saxifraga adscendens L. ssp. oregonensis (Raf.) Bacig. | SAADO2 |
| smallflower grass of Parnassus | Parnassia palustris L. var. parviflora (DC.) Boivin | PAPAP2 |
| smallflower miterwort | Mitella stauropetala Piper | MIST3 |
| smallflower miterwort | Mitella stauropetala Piper var. stauropetala | MISTS2 |
| smallflower woodland-star | Lithophragma parviflorum (Hook.) Nutt. ex Torr. & Gray | LIPA5 |
| smallflower woodland-star | Lithophragma parviflorum (Hook.) Nutt. ex Torr. & Gray var. parviflorum | LIPAP3 |
| spiked saxifrage | Saxifraga spicata D. Don | SASP4 |
| stiffstem saxifrage | Saxifraga hieraciifolia Waldst. & Kit. ex Willd. | SAHI5 |
| stiffstem saxifrage | Saxifraga hieraciifolia Waldst. & Kit. ex Willd. var. angusticapsula Hult | SAHIA |
| stiffstem saxifrage | Saxifraga hieraciifolia Waldst. & Kit. ex Willd. var. hieraciifolia | SAHIH |
| stiffstem saxifrage | Saxifraga hieraciifolia Waldst. & Kit. ex Willd. var. rufopilosa Hult | SAHIR |
| storm saxifrage | Saxifraga tempestiva Elvander & Denton | SATE5 |
| strawberry saxifrage | Saxifragopsis fragarioides (Greene) Small | SAFR5 |
| suksdorfia | Suksdorfia Gray | SUKSD |
| Suksdorfia ranunculifolia | Boykinia ranunculifolia (Hook.) Gray | BORA5 |
| Suksdorfia ranunculifolia | Hemieva ranunculifolia (Hook.) Raf. | HERA4 |
| Sullivant's coolwort | Sullivantia sullivantii (Torr. & Gray) Britt. | SUSU3 |
| Sullivantia hapemanii var. purpusii | Sullivantia purpusii (Brand) Rosendahl | SUPU |
| Sullivantia sullivantii | Saxifraga sullivantii Torr. & Gray | SASU12 |
| Sullivantia sullivantii | Sullivantia ohionis Torr. & Gray ex Gray | SUOH |
| Sullivantia sullivantii | Sullivantia renifolia Rosendahl | SURE |
| tall alumroot | Heuchera chlorantha Piper | HECH |
| Telesonix heucheriformis | Boykinia heucheriformis (Rydb.) Rosendahl | BOHE3 |
| Telesonix heucheriformis | Boykinia jamesii (Torr.) Engl. var. heucheriformis (Rydb.) Engl. | BOJAH |
| Telesonix heucheriformis | Telesonix jamesii (Torr.) Raf. var. heucheriformis (Rydb.) Bacig. | TEJAH |
| Telesonix jamesii | Boykinia jamesii (Torr.) Engl. | BOJA |
| Telesonix jamesii | Saxifraga jamesii Torr. | SAJA5 |
| tellima | Tellima R. Br. | TELLI |
| Tellima grandiflora | Tellima odorata T.J. Howell | TEOD |
| Texas saxifrage | Saxifraga texana Buckl. | SATE4 |
| three toothed saxifrage | Saxifraga tricuspidata Rottb. | SATR5 |
| threeleaf foamflower | Tiarella trifoliata L. | TITR |
| threeleaf foamflower | Tiarella trifoliata L. var. laciniata (Hook.) Wheelock | TITRL |
| threeleaf foamflower | Tiarella trifoliata L. var. trifoliata | TITRT |
| threeparted miterwort | Mitella trifida Graham | MITR4 |
| threeparted miterwort | Mitella trifida Graham var. trifida | MITRT |
| threeparted miterwort | Mitella trifida Graham var. violacea (Rydb.) Rosendahl | MITRV |
| thymeleaf saxifrage | Saxifraga serpyllifolia Pursh | SASE7 |
| Tiarella cordifolia var. collina | Tiarella wherryi Lakela | TIWH |
| Tiarella cordifolia var. cordifolia | Tiarella macrophylla Small p.p. | TIMA3 |
| Tiarella trifoliata var. laciniata | Tiarella californica (Kellogg) Rydb. | TICA5 |
| Tiarella trifoliata var. laciniata | Tiarella laciniata Hook. | TILA4 |
| Tiarella trifoliata var. unifoliata | Tiarella trifoliata L. ssp. unifoliata (Hook.) Kern | TITRU2 |
| Tiarella trifoliata var. unifoliata | Tiarella unifoliata Hook. | TIUN3 |
| Tobias's saxifrage | Saxifraga bryophora Gray var. tobiasiae J. Grimes & Packard | SABRT |
| Tolmie's saxifrage | Saxifraga tolmiei Torr. & Gray | SATO2 |
| Tolmiea menziesii | Tiarella menziesii Pursh | TIME2 |
| tufted alpine saxifrage | Saxifraga caespitosa L. | SACA50 |
| tufted alpine saxifrage | Saxifraga caespitosa L. ssp. caespitosa | SACAC4 |
| tufted alpine saxifrage | Saxifraga caespitosa L. ssp. delicatula (Small) Porsild | SACAD2 |
| tufted alpine saxifrage | Saxifraga caespitosa L. ssp. monticola (Small) Porsild | SACAM2 |
| tufted alpine saxifrage | Saxifraga caespitosa L. ssp. sileneflora (Sternb. ex Cham.) Hult | SACAS4 |
| tufted alpine saxifrage | Saxifraga caespitosa L. ssp. subgemmifera Engl. & Irmsch. | SACAS5 |
| tufted alpine saxifrage | Saxifraga caespitosa L. ssp. uniflora (R. Br.) Porsild | SACAU3 |
| tufted alumroot | Heuchera caespitosa Eastw. | HECA36 |
| twoleaf miterwort | Mitella diphylla L. | MIDI3 |
| urnflower alumroot | Heuchera elegans Abrams | HEEL2 |
| Utah alumroot | Heuchera parvifolia Nutt. ex Torr. & Gray var. utahensis (Rydb.) Garrett | HEPAU |
| violet suksdorfia | Suksdorfia violacea Gray | SUVI |
| Vreeland's saxifrage | Saxifraga ferruginea Graham var. vreelandii (Small) Engl. & Irmsch. | SAFEV |
| weak saxifrage | Saxifraga rivularis L. | SARI8 |
| wedgeleaf saxifrage | Saxifraga adscendens L. | SAAD |
| western swamp saxifrage | Saxifraga apetala Piper | SAAP4 |
| whiplash saxifrage | Saxifraga flagellaris Willd. ex Sternb. | SAFL6 |
| whiplash saxifrage | Saxifraga flagellaris Willd. ex Sternb. ssp. flagellaris Willd. ex Sternb. [excluded] | SAFLF2 |
| whiplash saxifrage | Saxifraga flagellaris Willd. ex Sternb. ssp. setigera (Pursh) Tolm. | SAFLS |
| white alumroot | Heuchera alba Rydb. | HEAL8 |
| White Mountain alumroot | Heuchera wootonii Rydb. | HEWO |
| White Mountain saxifrage | Saxifraga paniculata P. Mill. | SAPA14 |
| White Mountain saxifrage | Saxifraga paniculata P. Mill. ssp. neogaea (Butters) D. L?ve | SAPAN |
| wholeleaf saxifrage | Saxifraga integrifolia Hook. | SAIN4 |
| Williams's miterwort | Conimitella williamsii (D.C. Eat.) Rydb. | COWI |
| wood saxifrage | Saxifraga mertensiana Bong. | SAME7 |
| woodland-star | Lithophragma (Nutt.) Torr. & Gray | LITHO2 |
| Wright's golden saxifrage | Chrysosplenium wrightii Franch. & Savigny | CHWR2 |
| Wright's golden saxifrage | Chrysosplenium wrightii Franch. & Savigny var. beringianum (Rose) Hara | CHWRB |
| Wright's golden saxifrage | Chrysosplenium wrightii Franch. & Savigny var. wrightii | CHWRW |
| yellow coralbells | Elmera racemosa (S. Wats.) Rydb. | ELRA3 |
| yellow coralbells | Elmera racemosa (S. Wats.) Rydb. var. puberulenta C.L. Hitchc. | ELRAP |
| yellow coralbells | Elmera racemosa (S. Wats.) Rydb. var. racemosa | ELRAR |
| yellow marsh saxifrage | Saxifraga hirculus L. | SAHI3 |
| yellow marsh saxifrage | Saxifraga hirculus L. ssp. compacta K.O. Hedb. | SAHIC2 |
| yellow marsh saxifrage | Saxifraga hirculus L. ssp. hirculus | SAHIH2 |
| yellow marsh saxifrage | Saxifraga hirculus L. ssp. propinqua (R. Br.) A.& D. L?ve | SAHIP2 |
| yellow mountain saxifrage | Saxifraga aizoides L. | SAAI |
| yellow saxifrage | Saxifraga sibthorpii Boiss. | SASI7 |
| yellowdot saxifrage | Saxifraga bronchialis L. | SABR6 |
| yellowdot saxifrage | Saxifraga bronchialis L. ssp. cherlerioides (D. Don) Hult | SABRC |
| yellowdot saxifrage | Saxifraga bronchialis L. ssp. codyanus (Zhmylev) Cody | SABRC4 |
| yellowdot saxifrage | Saxifraga bronchialis L. ssp. vespertina (Small) Piper | SABRV2 |
| Yellowstone saxifrage | Saxifraga subapetala E. Nels. | SASU6 |
| youth on age | Tolmiea menziesii (Pursh) Torr. & Gray | TOME |
| youth on age | Tolmiea Torr. & Gray | TOLMI |