Orbexilum simplex (Nuttall ex Torrey & A. Gray) Rydberg. Subgenus: Poikadenia. Leather-root. Phen: May-Jun. Hab: Prairies, open woodlands. Dist: AR and OK south to s. AL, MS, e. and w. LA, and e. TX; perhaps disjunct in IL.
Origin/Endemic status: Endemic
Synonymy: = Ar, Il, K1, K3, NcTx, S, SE3, Grimes (1988), Grimes (1990), Isely (1998), Turner (2008); = n/a – C, Lewis et al. (2005) et al. (2004); = Psoralea simplex Nutt. ex Torr. & A.Gray – Tx
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