Poteridium annuum (Nuttall ex Hooker) Spach. Phen: Apr-May. Hab: Prairies, pastures, roadsides. Dist: W. AR and OK south to c. TX; BC south to NV and CA; scattered occurrences elsewhere are apparently the result of introductions.
Origin/Endemic status: Native
Synonymy: = FNA9, K3, K4, NY; = n/a – C; = Sanguisorba annua (Nutt. ex Hook.) Torr. & A.Gray – Ar, G, GrPl, K1, NcTx, RAB, Tx, Robertson (1974)