The common name of echinocereus rigidissimus is rainbow cactus. It is native to Arizona and New Mexico.
L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917)
1765×2400, 2.1 MiB
753×1024, 156.2 KiB
470×640, 82.2 KiB
235×320, 27.3 KiB