Infrequent in sink holes in Lawrence, Orange, and Washington Counties, but not seen in sink holes in other counties where the same habitat occurs. The specimen found in Warrick County was found in the old canal near Millersburg. It was very common in the ponds where it was found, although stock had injured it.
Stems typically submersed with the tips floating, less often emersed, 2-6 dm, the younger parts usually hairy but soon glabrate; lvs very thin, obovate to subrotund, 1-3.5 cm, entire, palmately 5-13-veined; fls usually 2-4 from the uppermost nodes, on pedicels (0.5)1-1.5 cm, without bractlets; sep 3-5 mm, obtuse, the upper one rotund-elliptic, obscurely to evidently reticulate-veiny; cor white with a yellow throat, narrowly campanulate, mostly 4-10 mm, its lobes equaling or a little shorter than the tube, the 2 upper united half-length; stigmas 2, distinct; 2n=36. Shallow water and wet soil; Ind. to Io., N.D., and Mont., s. to Miss. and Tex., and occasionally intr. elsewhere, as in tidal Va. and Md. June-Sept. (B. simulans; Bramia r.; Macuillamia r.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.