Echinocereus adustus
Echinocereus adustus, Mem. Tour N. Mexico: 104. 1848 sec. Sánchez & al. 2018
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The three subspecies of E. adustus show variation in the number and length of both central and radial spines, and have minor differences in flowers and fruits. Echinocereus adustus subsp. roemerianus represents the most different taxon of them.A