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Standard Cyclopedia of Horticulture
Mammillaria tetrancistra, Engelm. (M. phellosperma, Engelm.) Ovate or ovate-cylindrical, rather large, simple or sparingly branched from the base: young axils sparingly setose: radial spines 30-60, in 2 series; exterior bristle-like, white; interior stouter and longer, dusky- tipped or purplish: centrals 1-4, longer, brown or blackish, sometimes all hooked, the upper ones sometimes straight: seed with a brown corky base. S. Calif, to Utah.
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