Perideridia americana (Nuttall ex A.P. de Candolle) Reichenbach. Eastern Yampah. Phen: Apr-Jul. Hab: Floodplains, oak savannahs, prairies, rocky woodlands, dolomite glades, shale barrens, and open woodlands, usually on limestone but less typically on sandstone. Dist: OH, IN, IL, IA, and KS south to ne. AL, nw. AL, wc. MS, n. AR, and OK.

Origin/Endemic status: Native

Synonymy: = Ar, C, F, G, GrPl, Il, K1, K3, K4, MC, Mo2, Ok, Tn, Sun & Downie in FNA () (in prep); = Eulophus americanus Nutt. ex DC. – S

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