Orbexilum pedunculatum (P. Miller) Rydberg. Subgenus: Poikadenia. Western Sampson's-snakeroot. Phen: May-Jul; Jul-Sep. Hab: Open woodlands, bluffs, prairies. Dist: S. OH, s. IN, s. IL, c. MO, and se. KS, south to sw. NC, sc. SC, sw. GA, w. Panhandle FL, s. AL, s. LA, and e. TX.

Origin/Endemic status: Native

Taxonomy Comments: See Vincent (2014) for detailed discussion of the nomenclature.

Synonymy: = K4, Mi, NcTx, S, Tn, Turner (2008), Vincent (2014); = Orbexilum pedunculatum (Mill.) Rydb. var. pedunculatum – Ar, C, K1, K3, SE3, Grimes (1988), Grimes (1990), Isely (1998); = Psoralea melilotoides Michx., superfluous name; = Psoralea psoralioides (Walter) Cory var. eglandulosa (Elliott) F.L.Freeman – F, G, GrPl, GW2, RAB, Tx, W; > Orbexilum pedunculatum (Mill.) Rydb. var. gracile (Torr. & A.Gray) J.W.Grimes – Il, misapplied

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