Orbexilum psoralioides (Walter) Vincent. Subgenus: Poikadenia. Eastern Sampson's-snakeroot. Phen: May-Jul; Jul-Sep. Hab: Longleaf pine savannas, loamy longleaf pine sandhills, open woodlands. Dist: Primarily on the Atlantic Coastal Plain, ranging from e. VA to ne. FL and Panhandle FL, inland to the Piedmont of NC and SC.

Origin/Endemic status: Endemic

Taxonomy Comments: Vincent (2014) discussed the nomenclature in detail.

Synonymy: = Lewis et al. (2005) et al. (2004), Vincent (2014); = Orbexilum gracile (Torr. & A.Gray) Rydb. – S, Turner (2008); = Orbexilum pedunculatum (Mill.) Rydb. var. gracile (Torr. & A.Gray) J.W.Grimes – C, SE3, Grimes (1988), Grimes (1990), Isely (1998); = Orbexilum pedunculatum (Mill.) Rydb. var. psoralioides (Walter) Isely – K1, K3, Va; = Psoralea gracilis Torr. & A.Gray; = Psoralea psoralioides (Walter) Cory var. psoralioides – F, G, GW2, RAB; < Orbexilum pedunculatum (Mill.) Rydb. – WH3

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