Orbexilum onobrychis (Nuttall) Rydberg. Subgenus: Orbexilum. Lanceleaf Scurfpea. Phen: (May-) Jun-Aug; Aug-Oct. Hab: Calcareous or mafic woodlands and barrens, prairies. Dist: Primarily a species of prairies and prairie-like areas of OH and KY west to se. IA and e. MO, O. onobrychis also occurs (at least formerly) as rare disjunct populations south to Mountains of w. NC (Sawyersville, 1891), w. VA, e. TN, the Interior Low Plateau of c. TN and nw. AL, and the Interior Highlands of n. AR. No basis can be found for the alleged occurrence of this species in Spartanburg County, SC.

Origin/Endemic status: Native

Synonymy: = Ar, C, Il, K1, K3, K4, S, SE3, Tn, Va, Grimes (1988), Grimes (1990), Isely (1998), Turner (2008); = Psoralea onobrychis Nutt. – F, G, RAB, S13, W

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Heliophily: 7