Mammillaria grusonii

Mammillaria grusonii usually grows singly. This cactus is spherical to thick cylindrical, bright green, with a diameter of about 25 centimetres (9.8 in). The tubercles are four-angled and contain latex. The axillae are initially woolly, later naked. The spines are straight, reddish and becomes white with age. The two central spines are 0.4 to 0.6 centimeters long, while the 12 to 14 radial spines are 0.6 to 0.8 centimeters long. The pale yellow, bell-shaped flowers are up to 2.5 centimeters long and have an equal diameter. The fruits are bright scarlet and contain brown seeds.

This species can be found in Mexico (in the states of Coahuila and Durango), at an altitude of 800–1,850 metres (2,620–6,070 ft) above sea level.

• Ulises Guzmán; Salvador Arias; Patricia Dávila (2003), Catálogo de cactáceas mexicanas, Universidad Nacional Autónoma de México, p. 140, ISBN 970-9000-20-9
• Mammillarias.net^[usurped]
• Distribution Map^[usurped]
• Cacti Guide
• Desert-tropical Archived 2012-09-21 at the Wayback Machine

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