Pilosocereus purpusii Lectotype: Mexico, Sinaloa, Mazatlán, near the town overlooking the sea, 31 Mar 1910, J. Rose, P. Standley & Russell 13749 (US: 00115544, isolectotype: NY 00120558) Mexico, Guerrero, Cañón del Zopilote, alt. 800 m (not preserved)