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Baker, M. (2006). "A new florally dimorphic hexaploid, Echinocereus yavapaiensis sp. nov. (section Triglochidiatus, Cactaceae) from central Arizona". Plant Systematics and Evolution. 258 (1–2): 63–83. doi:10.1007/s00606-005-0390-9. ISSN0378-2697.