Peniocereus greggii (Engelm.) Britton & Rose [ Cereus greggii Engelm.]
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Peniocereus greggii (Engelm.) Britton & Rose [ Cereus greggii Engelm.] [Cactaceae]
Rep. U.S. Mex. Bound. (Cactaceae of the boundary): t. 64 () [P. Roetter]