Mammillaria tetrancistra
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Mammillaria tetrancistra |
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| Engelm. |
Mammillaria tetrancistra is a species of the genus Mammillaria in the cactus family(Cactaceae). The specific epithet tetrancistra means '(Latin tetrancistrus) with four hooks (thorns)'.
description
Mammillaria tetrancistra grows individually or in groups with bulbous roots. The cylindrical to egg-shaped shoots are light green to gray. They grow up to 10 inches high and 3 to 8 inches in diameter. The cylindrically shaped warts do not contain milk juice . The axillae are covered with bristles. The 3 to 4 central spines are needle-like, brown or black. They are 1.4 to 2.5 inches long with the lowest hooked. The 30 to 60 radial spines are arranged in two rows. They are hair-like in one another, the outermost stronger, white with a dark tip and 6 to 10 millimeters long.
The lavender-colored flowers are bordered with white. They are up to 2.5 inches long with a diameter of 2.5 to 3.5 inches. The red fruits are up to 1.2 inches long. They contain dome-shaped, black, pitted seeds with a showy, corky appendage.
Distribution, systematics and endangerment
Mammillaria tetrancistra is distributed in the US states of California , Arizona , Nevada and Utah and in the Mexican states of Baja California and Sonora .
The first description was in 1852 by George Engelmann . Synonyms of Mammillaria tetrancistra Engelm. are Phellosperma tetrancistra (Engelm.) Britton & Rose (1923) and Bartschella tetrancistra (Engelm.) Doweld (2000).
In the Red List of Threatened Species of the IUCN , the species is listed as " Least Concern (LC) ". H. listed as not endangered.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . 2nd Edition. Eugen Ulmer KG, Stuttgart 2011, ISBN 978-3-8001-5964-2 , pp. 412 .
- NL Britton , JN Rose : The Cactaceae . Descriptions and Illustrations of Plants of the Cactus Family . tape IV . The Carnegie Institution of Washington, Washington 1923, p. 60 ( online ).
- Ulises Guzmán, Salvador Arias, Patricia Dávila: Catálogo de cactáceas mexicanas . Universidad Nacional Autónoma de México, Mexico City 2003, ISBN 970-9000-20-9 , pp. 161 .
Individual evidence
- ^ Notes on the Cereus giganteus of South Eastern California and some other Californian Cactaceae. In: American Journal of Science and Arts. 2nd episode, Volume 14, 1852, pp. 337-338 (online) .
- ↑ Mammillaria tetrancistra in the Red List of Threatened Species of the IUCN 2013.2. Posted by: Reina, AL, Porter, JM & Van Devender, T., 2010. Retrieved December 23, 2013.
