Euphorbia humistrata Engelmann. Phen: Apr-Oct. Hab: Floodplain forests, exposed river shores, rocky riverside gravel bars, disturbed areas, some of the easternmost occurrences apparently adventive from farther west. Dist: OH, IL, MO, and e. KS south to Panhandle FL and e. TX; scattered eastward, apparently as an adventive.
Origin/Endemic status: Native
Synonymy: = Ar, C, F, FNA12, G, GrPl, K3, Tn, Va, WV, Govaerts, Frodin, & Radcliffe-Smith (2000); = Chamaesyce humistrata (Engelm.) Small – Fl2, GW2, Il, K1, S, WH3; = n/a – RAB