Author:
Arias Salvador,Terrazas Teresa
Abstract
A comprehensive taxonomic revision of the genus Pachycereus (Cactaceae, Cactoideae, Pachycereeae) is presented. Pachycereus is characterized by one synapomorphic character, the presence of a narrow interareolar groove, and by the combination of flowering region differentiated
with flexible spines, flower with a narrow region between the pericarpel and the receptacular tube and the occurrence of trichomes and short spines in the pericarpel. Five species are recognized in the present treatment. One species (P. pecten-aboriginum) is widely distributed from
Chihuahua in northern Mexico to Chiapas, three species (P. grandis, P. pringlei, and P. weberi) are restricted to defined floristic provinces, and one species (P. tepamo) is endemic to Depresion del Balsas. A key and descriptions of the species, based on herbarium
specimens, field observations and intensive field collection are presented. The taxonomic history, synonymies, distribution, uses, and representative specimens are included. Three new combinations, Pterocereus gaumeri subsp. foetidus, Lemaireocereus lepidanthus, and Lophocereus
marginatus, are proposed.
Publisher
American Society of Plant Taxonomists
Subject
Plant Science,Genetics,Ecology, Evolution, Behavior and Systematics
Cited by
12 articles.
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