This is a widespread variable polyploid of midwestern regions, usually in wet meadows, shores or streambanks; reported 2n = 154 and 168 (FNA 3, K; Soza et al. 2013). Although dasycarpum replaces pubescens west of the Mississippi and Ohio Rivers, there is some overlap of ranges. There are several records from s Ill., s. Ind and s. Ohio (especially along the Ohio River, A. Cusick, pers. comm.), but dasycarpum appears to have become rare in Ky., with virtually no records after 1970; most mapped records come from B. It has often been misidentified as amphibolum or pubescens, with which it may intergrade (FNA 3). Compared to pubescens, flowering of dasycarpum is generally earlier (May to late Jul versus mid-Jun ro early Aug). It is rarely bisexual (versus often so). Its anthers are usually longer (ca. 1-4 mm versus 0.5-2. mm), and strongly apiculate (versus blunt or slightly apiculate), with filaments filiform and drooping (versus rigid, prominently clavate, ascending). Achenes have a beak that is more or less straight, about as long as the body (versus straight to distally coiled, about half as long), and an obtuse, sessile to subsessile base (versus narrowed, stipitate). Stems are often purplish, especially at nodes. Also, leaves of at least "western plants [are] occasionally glabrous" but typical pubescens is minutely puberulent (Cr, W). Despite some ancient medicinal uses of this species (Moerman 1986), there has been little recent publication on its chemistry (Kupchan et al. 1969, Kuzmanov & Dutschewska 1982).