Mammillaria geminispina
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Mammillaria geminispina subsp. geminispina |
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| Scientific name | ||||||||||||
| Mammillaria geminispina | ||||||||||||
| Haw. |
Mammillaria geminispina is a species of the genus Mammillaria in the cactus family(Cactaceae). The specific epithet is derived from the Latin words gemini for 'twin' and spina for 'thorn' and refers to the two central spines that are usually present.
description
Mammillaria geminispina has a short cylindrical body with a height of up to 18 cm and a diameter of up to 8 cm. It tends to form large, white, closed groups. The 16 to 20 chalky white radial spines are only 5–7 mm long. They are crowned by two to six central spines up to 4 cm long . The flowers are deep pink to carmine red with a dark center and a size up to 2 cm in diameter. The fruits are carmine red. The seeds are brown.
Mammillaria geminispina subsp. leucocentra differs from the nominate form by 5 to 6 central spines.
Distribution, systematics and endangerment
Mammillaria geminispina is native to the Mexican states of Hidalgo , Querétaro and San Luis Potosi . Here it occurs at an altitude of 900 to 1800 meters.
It was first described in 1824 by Adrian Hardy Haworth .
The following species and varieties are synonyms :
Mammillaria bicolor loam. (1830), Mammillaria dedalea Scheidw. (1837), Mammillaria nivea H. Wendl. ex whistle. (1837), Mammillaria bicolor var. Nivea (H. Wendl. Ex Pfeiff.) K.Schum. (1898), Mammillaria geminispina var. Nivea H. Wendl. Borg (1937), Mammillaria toaldoae clay. (1838), Mammillaria eburnea Lem. (1839), Mammillaria nivea var. Daedalea Lem. (1839), Mammillaria nobilis Pfeiff. (1840), Mammillaria bicolor var. Nobilis (Pfeiffer). CFFörst. (1846), Mammillaria geminispina var. Nobilis (Pfeiff.) Backeb. (1961), Mammillaria bicolor var. Longispina Salm-Dyck (1845), Mammillaria nivea var. Brevispina Hildm. (1888), Mammillaria geminispina var. Brevispina (Hildm.) Backeb. (1961), Mammillaria leucocentra A.Berg (1840), Mammillaria albata Repp. (1987) Mammillaria albata var. Longispina Repp. (1987) and Mammillaria albata var. Sanciro Repp. (1987).
The following subspecies are distinguished:
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Mammillaria geminispina subsp. geminispina Haw. :
The nominate form has two white central spines with a dark tip -
Mammillaria geminispina subsp. leucocentra (A.Berg) DRHunt :
It was first described in 1840 by Alexander Berg as Mammillaria leucocentra . David Richard Hunt introduced it in 1997 as a subspecies to Mammillaria geminispina . The subspecies has 5 to 6 pure white central spines.
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. 382 .
- Werner Reppenhagen : The genus Mammillaria . tape 2 . Steinhart, Titisee Neustadt 1992, p. 547,550 .
- Karl Schumann : Complete description of the cacti (Monographia cactacearum) . J. Neumann, Neudamm 1899, p. 569 ( online ).
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, ISBN 3-540-00489-0 , p. 92.
- ^ Haworth: Descriptions of some new Cacti and Mammillariae, recently brought from Mexico by Mr. Bullock of the Egyptian Hall, Piccadilly; and now preserved, with many other very rare plants in the Nursery of Mr. Tate, in Sloanestreet . In: Philosophical Magazine . Volume 63, 1824, p. 42, (online) .
- ↑ Alexander Berg: Description of some new cacti . In: General garden newspaper . Volume 8, 1840, p. 130, (online) .
- ↑ DR Hunt: Mammillaria Postscripts . Volume 6, 1997; P. 10.
- ↑ Mammillaria geminispina in the IUCN Red List of Threatened Species 2013.2. Posted by: Gómez-Hinostrosa, C., Sánchez, E., Guadalupe Martínez, J. & Bárcenas Luna, R., 2009. Retrieved December 27, 2013.
