Leaves: petiole sparsely to densely long stipitate-glandular; blade surfaces sparsely to densely long stipitate-glandular abaxially, sparsely short stipitate-glandular adaxially, hairs 0.7-2.5 mm. Hypanthia densely long stipitate-glandular. 2n = 14.
Flowering Jul-Sep. Shaded or north-facing sandstone or limestone ledges or rock undercuts; 300-800 m; Ala., Ill., Ind., Ky., Miss., Mo., N.C., S.C., Tenn., Va., W.Va.
Variety parviflora is sparsely to densely long stipitate-glandular on petioles, peduncles, and abaxial leaf surfaces. It is the more widespread variety in the species, occupying a large area in the southern Appalachian Mountains and Interior Plateau east of the Mississippi River and in Missouri.
From Flora of Indiana (1940) by Charles C. Deam
Our only specimen of this rare alumroot is one which I found in a pocket on the perpendicular face of a sandstone cliff on a farm about 2 miles southwest of Leopold, Perry County. The leaves were quite purplish on the lower surface.