This globally restricted winter annual is known mostly from plowed, eroded, rocky or otherwise bared soils on river-bottoms and calcareous glades in c. Tenn. (FNA 7). See also O'Kane & Al-Shehbaz (2002) for support of new generic circumscriptions. The record from Ala. is dubious (Chester 2017). The record from Ky. has been considered adventive (Al-Shehbaz 1987). But this single locality in Ky. is merely a outlying downstream extension of a much larger populations in corn fields along the Cumberland Rv. and its tributaries in Tenn. Chester (1982, 1992) discovered the small Ky. population in 1981on alluvial bottomland at the terminus of LBL Road 204 between Crockett Bay and Prior Bay, just north of the state line. The species has not been recorded at this site since 1985, despite much searching (Chester 2017). However, Carol & Jerry Baskin in FAYE have established a spreading population along the sidewalk of their house, mowed in summer after seeding in April.