(1919) Orbexilum, commonly called leather-root,[2] is a genus of flowering plants in the legume family (Fabaceae).

They are native to North America, where they are found in the United States and Mexico, south to Chiapas.

[3] This genus can be distinguished from other genera in the Psoraleeae by its "thick glabrous pod walls that are distinctively rugose and by [a] calyx that is scarcely accrescent.

"[4] The genus was described by Constantine Samuel Rafinesque in 1832, with the type species O. latifolia, moved from Psoralea.

[6]) Rafinesque differentiated Orbexilum from Psoralea largely on the basis of features of the calyx.