| Author | Le Conte ex Torrey | |
| Distribution | Found essentially throughout the southern Coastal Plain, including all of the Sandhills region; ranges north to Harnett, Wayne, and Dare counties. Not yet known from the Piedmont, other than a recent (2011) collection from a pond in far western Rutherford County.
This is essentially a Coastal Plain species, ranging from MA south to northern FL, and west to eastern TX. | |
| Abundance | Frequent to locally fairly common in the southern part of the range, but rather rare north to Tyrrell and Dare Counties. Extremely rare in the Piedmont. | |
| Habitat | The habitats are essentially the same as for many bladderwort species -- shallow and still fresh water of pools, lake and pond margins, and wet ditches. However, it often grows more frequently in mud than similar matted species. |
| Phenology | Blooms mainly from May to July, and rarely as late as November. | |
| Identification | This species is still another bright yellow-flowered bladderwort with filamentous/fibrous leaves growing in a tangle so as to form a mat in shallow water. This species and the rare-in-NC U. floridana have leaves of two types -- one with typical small bladders or traps along the leaves, and the second type with essentially no such bladders. This species differs from U. biflora by larger flowers, often about 1-inch spread, and typically more than just two flowers (often 3-6); the latter has all leaves of a single type (with bladders). The flowering stem often reaches about 10 inches high, and thus this is a fairly stately bladderwort when in bloom. Most biologists are likely to be able to identify this species by inflorescence alone, without having to pull plants out of the water and examining the leaves -- especially as U. floridana is now considered of historical occurrence in the state. | |
| Taxonomic Comments | This species was previously known as U. fibrosa (such as in RAB 1968).
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| Other Common Name(s) | Fibrous Bladderwort | |
| State Rank | S3? [S3] | |
| Global Rank | G4G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
