Eupatorium semiserratum A.P. de Candolle. Phen: Late Jul-Oct. Hab: Swamp forests, seepage bogs, savannas, clay-based Carolina bays, other wetlands. Dist: Se. VA south to ne. FL, Panhandle FL, west to TX and AR; disjunct in sc. TN.
ID notes: This species often has 3 leaves per node; most similar species rarely or never have whorled leaves.
Origin/Endemic status: Endemic
Syn: = Ar, C, Fl7, FNA21, G, GW2, K1, K3, K4, RAB, S, SE1, Tn, Va, WH3; = Eupatorium cuneifolium var. semiserratum – F; < Eupatorium glaucescens – Tx