Mammillaria parkinsonii
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Mammillaria parkinsonii subsp. parkinsonii |
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Mammillaria parkinsonii is a species of the genus Mammillaria in the cactus family(Cactaceae). In English it is often referred to as the gray 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 shoot that later branches out. It has a cylindrical, blue-green body that is up to 15 centimeters high and a diameter of 10 to 15 centimeters. The axillae are provided with numerous, fine, white and partly curved bristles that become more woolly in the flowering zone. The 2 to 5 central spines are usually slightly bent downwards. They are stiff, whitish in color with a dark tip and only 6 to 8 millimeters long. The lower of them are longer and even up to 3.8 centimeters long. At least 30 radial spines are very fine and slightly curved. They are 4 to 6 millimeters long.
The light yellow flowers have a red central stripe. They are 1.2 to 1.5 centimeters long and reach just such a diameter. The club-shaped fruits are colored red-orange. They are up to 1 centimeter long and contain brown seeds .
Distribution, systematics and endangerment
Mammillaria parkinsonii is distributed in the Mexican states of Guanajuato , Hidalgo and Querétaro , in mountainous regions between 1200 and 2400 meters.
It was first described in 1840 by Christian Gottfried Ehrenberg .
Synonyms are: Mammillaria auriareolis crucible (1933), Mammillaria dietrichiae crucible (1933), Mammillaria parkinsonii var. Dietrichii (crucible) Backeb. (1961), Mammillaria rosensis R.T. Craig (1945), Mammillaria parkinsonii var. Brevispina Remski (1954, nom. Inval. ICBN -Article 36.1) and Mammillaria tiegeliana Backeb. (1961, nom. Invalid ICBN -Article 37.1).
In the Red List of Threatened Species of IUCN is the species as " Endangered (EN) ," d. H. listed as endangered.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . 2nd Edition. Eugen Ulmer KG, Stuttgart 2011, ISBN 978-3-8001-5964-2 , pp. 399 .
- Theodor Rümpler : Carl Friedrich Förster's Handbook of Cacteenkunde in its entirety: Or, the most successful, cultural information based on the latest experience. Processed according to the current state of science and increased by the genera and newly introduced species established since 1846 . Wöller, 1886, p. 286 ( online ).
- Karl Schumann : Complete description of the cacti (Monographia cactacearum) . J. Neumann, Neudamm 1899, p. 570 ( online ).
- Ernst Schelle: Cacti . Alexander Fischer Verlag, Tübingen 1926, p. 324 .
Individual evidence
- ↑ a b Four new mammillaries, discovered and described by C. Ehrenberg : In: Linnaea . Volume 14, 1840, pp. 375-376, (online) .
- ↑ Mammillaria parkinsonii in the Red List of Threatened Species of the IUCN 2013.2. Posted by: Sánchez, E., Guadalupe Martínez, J. & Bárcenas Luna, R., 2009. Retrieved December 27, 2013.
