Mammillaria grusonii
Mammillaria grusonii
Mammillaria grusonii is a species of the genus Mammillaria in the cactus family ( Cactaceae ). The specific epithet honors the inventors, scientists, industrialists and cacti collector Hermann Gruson of Magdeburg.
Description
Mammillaria grusonii grows mostly single. The spherical to cylindrical thick bright green shoots are up to 25 inches in diameter in size. The warts are square and contain milky sap. The axillae are first naked woolly later. The spines are straight, reddish, in age becoming white. The mostly two central spines, one ascending and descending a, are 0.4 to 0.6 inches long. The 12 to 14 radial spines are 0.6 to 0.8 inches long.
The bright yellow, bell-shaped flowers are up to 2.5 inches long and have an equal diameter. The fruits are scarlet. They contain brown seeds.
Distribution, systematics and hazard
Mammillaria grusonii is common in the Mexican states of Coahuila and Durango.
The first description was in 1889 by C. Runge. Synonyms are Mammillaria zeyeriana F.Haage ex K.Schum. (1898), Mammillaria grusonii var zeyeriana ( F.Haage ex K.Schum. ) E.Kuhn (1980, nom. Inval. ICBN article 33.3), Mammillaria pachycylindrica Backeb. (1959 ), Mammillaria grusonii var pachycylindrica ( Backeb. ) E.Kuhn (1980, nom. Inval. ICBN article 33.3), Mammillaria tesopacensis var papasquiarensis Bravo ( 1966), Mammillaria papasquiarensis ( Bravo) Repp. (1987) and Mammillaria durangicola Repp. (1987).
In the Red List of Threatened Species IUCN, the type is known as " Least Concern ( LC) ," ie, than not led at risk.