Coryphantha longicornis

Structure and identification

The stem is initially spherical, later cylindrical, solitary or offsetting. Wool abundantly covers the apex. Tubercles change from conical to flattened and rhomboid, with a partly keeled base. Three central spines are stronger than the lateral ones. The dominant one projects distinctly and curves downwards. Yellow flowers have a red stripe on the outer side of the perianth. Fruits are small and green. [Dicht and Lüthy 2005, p. 150]

Habitat and variation

The monograph documents the species in northwestern Durango, on hills and slopes with lava gravel, often beneath shrubs and oaks. Variation in habit also arises from age. Older stems are taller than wide, and tubercle bases overlap increasingly clearly. [Dicht and Lüthy 2005, p. 150]

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