Mammillaria corbula Herrera, Rev. Univ. Cuzco 8: 61. 1919.
Nearly globular, growing in clumps of 5 to 8 plants; ribs 12 or more, strongly crenate; areoles filled with white wool; in cultivated plants few or no spines developing, but in wild plants appearing in clusters of 6 to 9, these yellowish, 3 to 5 cm. long; flowers opening in the evening, about 3 cm. long; tube short, bearing small scales, these hairy in their axils; outer perianth-segments lanceolate, acute, purplish; inner ones lanceolate, somewhat shorter and broader, acute, salmon-red; stamens and style greenish yellow, short, included; style 2.5 cm. long.
Type locality: Near Cuzco, Peru.
Distribution: On hills in the high Andean Valley of Peru.
Collected by J. N. Rose on hills at Juliaca, Peru, September 4, 1914 (No. 19090); also near Cuzco, September 2, 1914 (No. 19080), by O. F. Cook on the highlands of Peru in 1915 and by Fortunato L. Herrera near Cuzco in 1922.
Plate v, figure 2, shows a plant collected in 1914 by Dr. Rose at Juliaca, Peru, which flowered at the New York Botanical Garden in May 1916.
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