| Author | Aublet | |
| Distribution | For the time being, the editors map the species only in Brunswick County, following RAB (1968). Specimens elsewhere need critical examination.
According to Weakley's (2018) map and text, this species has a Southern Coastal Plain range, from southeastern NC south to central FL and west to eastern LA.
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| Abundance | Extremely rare, if still extant. Weakley (2018) has it as "rare" in the NC Coastal Plain, as opposed to "uncommon" in the same province for M. aubletii. NatureServe and NCNHP treat these two taxa as one species -- M. fluviatilis, and NCNHP gives it a State Rank of S3. However, that rank is appropriate for the much more numerous M. aubletii; as M. fluviatilis appears to be extremely rare in NC, the website editors rank it as S1?, but whether it is still extant in the state is not known. It is probably deserving of Significantly Rare status, but at a minimum the editors suggest it be placed on the Watch List. | |
| Habitat | Not well known in NC, as differentiation of the two taxa is not certain from herbarium collections. It likely occurs in shallow waters of pools and streams, as opposed to simply wet sands and boggy spots, including shallow water, for M. aubletii. | |
| Phenology | Flowers and fruits from May to June. | |
| Identification | The two Mayaca species are quite unusual plants, resembling mosses. This species has the flower stalks very short at 1-5 mm (barely 1/8-inch) long, grows mostly submerged, and the flower is white or purplish-pink. The much more common M. aubletii has each rounded petal purplish-pink on the outer 2/3rds and white toward the base, and the spread flower is about 1/3-inch across. | |
| Taxonomic Comments | The two Mayaca "species" are often treated just as a single one, variously named as one or the other. RAB (1968) and Weakley (2018, "provisionally") do treat these as separate species, whereas NatureServe does not -- treating both as M. fluviatilis. The website editors give M. aubletii a Global Rank of G5?
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| Other Common Name(s) | None | |
| State Rank | [S1?] | |
| Global Rank | G5 | |
| State Status | [W7] | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
