View source for Mammillaria heyderi

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|genus=Mammillaria
|species=heyderi
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Mammillaria heyderi, Muhlpf. (M. texensis, Lab.). Tubercles slender: spines short; radials 16-18, short, slender, white; central 1, darker, shorter than the lower radials, brown: fls. yellowish, with pale rosy streak in the petals. Ariz, to Texas.

Var. applanata, Engelm. Body much depressed, summit flat or concave: radial spines 15-22. Texas.

Var. hemisphaerica, Engelm. Top rounded: radial spines 9-12. N. E. Mex.
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