Mammillaria marcosii
Mammillaria marcosii
Mammillaria marcosii is a species of the genus Mammillaria in the cactus family ( Cactaceae ). The specific epithet honors the Mexican cactus growers Marcos Sierra Pichardo from the town of San Miguel de Allende, who discovered the species.
Description
Mammillaria marcosii forming irregular groups and grows with spherical to short cylindrical stems that reach a diameter of up to 5 centimeters. The cylindrical, rounded at the tip warts are soft fleshy. They contain no latex. The axillae are covered with wool and 15 wrinkled, up to 1.5 centimeters long bristles. The 7 to 14 needle-like central spines are white to yellowish to reddish brown to brown and 1 to 2 inches long. One of them is descending and vice hooked. The 16 to 25 straight, white radial spines are radiating and 4 to 12 millimeters long.
The yellowish white flowers are slightly tinged with pink. They are up to 1.5 inches long and can reach a diameter of 1 centimeter. The obovate to cylindrical, red fruits are 6 to 13 millimeters long and not protrude from the spines. They contain brownish black seeds.
Distribution, systematics and hazard
Mammillaria marcosii is common in the Mexican state of Guanajuato. The first description was in 1997 by Mr. and Mrs. Fitz Maurice and Charles Edward Glass.
Mammillaria marcosii is on the Red List of Threatened Species IUCN as " Critically Endangered (CR ) ', ie threatened with extinction, classified.