This southeastern species is largely restricted to acid soils with seepage of ground water. In Ky. the only verified population is at the Blood Rv. seeps in CALL (R. Athey colls. at EKY). E. aquaticum L. is a related species of the Atlantic Coastal Plain that was reported by Adams et al. (1968) from HICK at Murphys Pond, presumably based on integrifolium (M).