| Common Name | Scientific Name | Code |
| n/a | Callitriche intermedia Hoffmann ssp. intermedia Hoffmann [excluded] | CAINI6 |
| n/a | Callitriche intermedia Hoffmann [excluded] | CAIN52 |
| Bolander's water-starwort | Callitriche heterophylla Pursh ssp. bolanderi (Hegelm.) Calder & Taylor | CAHEB3 |
| Callitriche hermaphroditica | Callitriche autumnalis L. | CAAU15 |
| Callitriche heterophylla | Callitriche heterophylla Pursh var. heterophylla Pursh [superfluous autonym] | CAHEH5 |
| Callitriche heterophylla ssp. bolanderi | Callitriche bolanderi Hegelm. | CABO10 |
| Callitriche heterophylla ssp. bolanderi | Callitriche heterophylla Pursh var. bolanderi (Hegelm.) Fassett | CAHEB2 |
| Callitriche heterophylla ssp. heterophylla | Callitriche anceps Fern. | CAAN |
| Callitriche marginata | Callitriche sepulta S. Wats. | CASE21 |
| Callitriche palustris | Callitriche palustris L. var. verna (L.) Fenley ex Jepson | CAPAV2 |
| Callitriche palustris | Callitriche verna L. | CAVE2 |
| Callitriche pedunculosa | Callitriche nuttallii Torr. | CANU10 |
| Callitriche peploides | Callitriche peploides Nutt. var. semialata Fassett | CAPES |
| Callitriche terrestris | Callitriche austinii Engelm. | CAAU16 |
| Callitriche terrestris | Callitriche deflexa A. Braun | CADE4 |
| Callitriche terrestris | Callitriche deflexa A. Braun var. austinii (Engelm.) Hegelm. | CADEA |
| Callitriche terrestris | Callitriche deflexa A. Braun var. subsessilis Fassett | CADES2 |
| effluent water-starwort | Callitriche trochlearis Fassett | CATR2 |
| Fassett's water-starwort | Callitriche fassettii Schotsman | CAFA3 |
| longstock water-starwort | Callitriche longipedunculata Morong | CALO2 |
| matted water-starwort | Callitriche peploides Nutt. | CAPE16 |
| northern water-starwort | Callitriche hermaphroditica L. | CAHE2 |
| Nuttall's water-starwort | Callitriche pedunculosa Nutt. | CAPE44 |
| pond water-starwort | Callitriche stagnalis Scop. | CAST |
| terrestrial water-starwort | Callitriche terrestris Raf. | CATE19 |
| twoheaded water-starwort | Callitriche heterophylla Pursh | CAHE3 |
| twoheaded water-starwort | Callitriche heterophylla Pursh ssp. heterophylla | CAHEH |
| vernal water-starwort | Callitriche palustris L. | CAPA52 |
| water-starwort | Callitriche L. | CALLI6 |
| winged water-starwort | Callitriche marginata Torr. | CAMA3 |