This is the most widespread species of the genus, ranging south to Ala., north to s. Ind. and s. Ohio, and disjunct to the west in Ark. and Mo. (Al-Shehbaz 1988b, FNA 7). L. uniflora is a self-compatible winter-annual, largely restricted to rocky calcareous sites, like its congeners. It has relatively small flowers , with petals mostly 4-6 mm long and entire, but many ovules per ovary (18-26); also, leaf lobes are deeply dentate (versus shallowly dentate to entire) and the terminal lobe is only slightly larger than lateral. L. uniflora is less conservative in its habitats, and appears to benefit from occasional intensive disturbance by ungulates in rocky pastures, perhaps more so than the other species. However it is generally absent from the glades in BULL and JEFF with exigua. Both species have 2n = 22, but hybrids are not verified. Leavenworthia and the "draboid" genera (Tomostima, Abdra, Draba) are the only Brassicaceae in Ky. with leaves almost all confined to the basal rosette.