Plants mapped here appear to be largely of hybrid origin but may include a few more or less pure plants of A. androsaemifolium L. The latter ranges widely over northeastern and western North America, but tends to occur in more wooded habitats. It extends south in or near the higher Appalachians to c. Ga. (K, W). The hybrid with cannabinum is reported from a similar range; together, both taxa are locally frequent in Mo., n. Ill., n.Ind., n. Ohio and the higher Appalachians, but rare in Ky. and elsewhere in the Ohio Valley (K).There are a few records of pure A. androsaemifolium L. from ROWA (MDKY; Campbell et al. 1992) and perhaps elsewhere. Gm stated of it: "not uncommon about meadows and in open woodland in western Ky."; but no colls. have been found to support his statement. Based largely on F (see also, DiTomasso et al. 2009), both androsaemifolium and hybrids can usually be distinguished from cannabinum sensu lato (with sibiricum) by their larger flowers (4-10 mm long versus 2-6 mm), which are pink or pink-striped (versus greenish or white) and have more spreading to recurved lobes (versus ascending to erect). Seeds tend to be smaller (ca. 2.5-4 mm long versus 4-6 mm). Leaves tend to be broader in shape (L/W mostly 1.5-2 versus 2-3) and more spreading to reflexed (versus ascending to spreading).