Mammillaria parkinsonii
Mammillaria parkinsonii subsp. parkinsonii
Mammillaria parkinsonii is a species of the genus Mammillaria in the cactus family ( Cactaceae ). In English it is often referred to as Grey Donut cactus. The specific epithet honors the British consul in Mexico and Ehrenberg's friend John Parkinson.
Description
Mammillaria parkinsonii is a succulent plant, initially with a single drive, which then branches later. She has a cylindrical, blue - green body, which is up to 15 centimeters high, reaching a diameter of between 10 to 15 centimeters. The axillae are provided with numerous, fine, white and partly curved bristles that are more woolly in the Blühzone. The 2-5 central spines are usually slightly curved downward. You are stiff, whitish colored with a dark tip and only 6-8 millimeters long. The lower of them are longer, while even up to 3.8 inches long. At least 30 marginal teeth are very fine and slightly curved. They are 4-6 millimeters long.
The bright yellow flowers have a red center stripe. They are 1.2 to 1.5 inches long and achieve just such a diameter. The clavate fruits are colored orange. They are up to 1 cm long and contain brown seeds.
Distribution, systematics and hazard
Mammillaria parkinsonii is common in the Mexican states of Guanajuato, Hidalgo and Querétaro, in mountainous regions 1200-2400 meters.
The first description was in 1840 by Christian Gottfried Ehrenberg.
Synonyms are: Mammillaria auriareolis crucible ( 1933), Mammillaria dietrichiae crucible ( 1933), Mammillaria parkinsonii var dietrichii ( cup) Backeb. (1961 ), Mammillaria Rosensis RTCraig (1945 ), Mammillaria parkinsonii var brevispina Remski (1954, nom. Inval. ICBN article 36.1) and Mammillaria tiegeliana Backeb. (1961, nom. Inval. ICBN article 37.1).
In the Red List of Threatened Species IUCN, the type is called " Endangered ( EN ) ', ie performed as endangered.