| Name | Callitriche terrestris subsp. subsessilis (Fassett) Bacigalupo |
| Authorship | (Fassett) Bacigalupo |
| Rank | Subspecies |
| Placed in | Callitriche terrestris Rafinesque |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Callitriche terrestris subsp. subsessilis (Fassett) Bacigalupo |
| Identification made in | 2017 (1) |
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