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Solitary, globular cactus, up to 4 inches in diameter with milky sap; stem solitary, noticeably sunken on top, wider than tall; axils initially woolly; flowers mostly cream, forming a circle around stem below the apex. The flowers are cream to salmon colored and the fruits bright red but quite small. Flowering Mar-Aug; fruiting Aug-Mar.
Mammillaria heyderi is a very short cactus that can be difficult to spot in the winter when it is nearly below ground level and may be partially covered in gravel. In the spring and summer, it is usually above surrounding ground and more visible. Mammillaria heyderi is found on dry hillsides in lower to middle elevations. Chihuahuan desert scrub, Tamaulipan thorn scrub, and Edwards Plateau, usually limestone and alluvial substrates. Light shade in summer to full sun. Hardy at least to 10° F.
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