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Family ! Scientific Name Author Reference Date Cactaceae Pachycereus pringlei (S. Watson) Britton & Rose Contr. U.S. Natl. Herb. 12(10): 422 1909 Cactaceae Pachycereus pringlei fo. calvus (Engelm. ex J.M. Coult.) P.V. Heath Calyx 2(3): 107 1992 Cactaceae Pachycereus pringlei fo. constrictus P.V. Heath Calyx 2(3): 107 1992 Cactaceae Pachycereus pringlei fo. cristatus P.V. Heath Calyx 2(3): 107 1992 Cactaceae Pachycereus pringlei fo. gibbosus P.V. Heath Calyx 2: 107 1992

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! = Accepted by Missouri Botanical Garden, * = Invalid/Illegitimate