View source for Mammillaria bicolor

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|genus=Mammillaria
|species=bicolor
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|Temp Metric=°F
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Mammillaria bicolor, Lehm. Simple or proliferous: tubercles small, crowded, ovate-pyramidal: radial spines 16-20; centrals 2, less than 1 in. long, stouter, erect, black- tipped. Mex.

Var. nivea, Schum. Obovate proliferous tubercles conical: radial spines capillary; centrals 4, white, with dusky apex, upper one incurved, 1 in. long.
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