Stylophorum diphyllum (Michaux) Nuttall. Phen: Mar-Jun. Hab: Moist forests over calcareous rocks (such as limestone). Dist: S. QU, w. PA, s. MI, and WI, south to sw. VA, e. TN, nw. GA, sc. TN, and AR; introduced elsewhere from horticultural use.
Origin/Endemic status: Native
Synonymy: = Ar, C, F, FNA3, G, Il, K1, K3, K4, Mi, Pa, S, Tn, Va, W, WV; = n/a – RAB