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22. Echinocereus rigidissimus (Engelmann) F. Haage, Special Preisverz. 13. 1897.
Arizona rainbow cactus, rainbow hedgehog cactus
Cereus pectinatus Engelmann var. rigidissimus Engelmann, Proc. Amer. Acad. Arts 3: 279. 1856; Echinocereus pectinatus (Scheidweiler) Engelmann var. rigidissimus (Engelmann) Rümpler
Varieties 2 (1 in the flora): sw United States, Mexico.
Lower Taxon
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