Except for a single record from Ky., this globally rare species of siliceous outcrops and gravely roadsides is known only from the Ozark region (Ark., Mo., Okl.) and, disjunct by 400-500 miles, from the Piedmont or adjacent mountains of Ga. and S.C. (Y, W). A. aprica is closely related to brachycarpa, but it usually flowers a month later (April versus March), and is more restricted to the vicinity of natural outcrops (Y). In Ga. the species is restricted to "shallow soils on and around granite outcrops, usually near the edges of islands of eastern red cedar (Juniperus virginiana) trees" (Chafin 2007). The coll. from CALL (GH, MUR) by Woods (1983) was from a Tertiary sandstone outcrop near a road; it has been verified, but plants cannot be relocated at the site.