Mammillaria crucigera
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Mammillaria crucigera |
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Mammillaria crucigera is a species of the genus Mammillaria in the cactus family(Cactaceae). The specific epithet crucigera means '(Latin cruciger) carrying a cross, refers to the crossed thorns'.
description
Mammillaria crucigera grows singly or dividing dichotomously. The olive-green or gray-green shoots are flattened, spherical to short cylindrical in shape. They grow to be 10 centimeters high and 5 to 6 centimeters in diameter. The firm, not sharp-edged, keeled warts produce milky sap during the growing season . The axillae are covered with sparse white wool. The 4 to 5 central spines are whitish to wax yellow or brownish black in color. They are stiff and up to 0.2 inches long. The fine needle-like or bristly 16 to 30 radial spines are white and up to 0.2 centimeters long.
The small, funnel-shaped flowers hardly protrude from the thorns. They are more or less purple-pink. The red fruits contain small, brown seeds .
Distribution, systematics and endangerment
Mammillaria crucigera is common in the Mexican states of Oaxaca and Puebla at low altitudes.
It was first described in 1832 by Carl Friedrich Philipp von Martius .
The following subspecies are distinguished:
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Mammillaria crucigera subsp. crucigera :
Synonyms are the following species and varieties described: Mammillaria buchauii Backeb. ex Mottram (1980) and Mammillaria cruzigera var. grandiosa Linzen, Rogoz & Frank Wolf (1998). -
Mammillaria crucigera subsp. tlalocii (Repp.) DRHunt :
The first description was in 1987 as Mammillaria tialocii by Werner Reppenhagen . David Richard Hunt introduced the species in 1997 as a subspecies to Mammillaria crucigera . The following species and varieties are synonyms: Mammillaria tlalocii Repp. (1987) and Mammillaria cruzigera var. Tlalocii (Repp.) Linzen, Rogoz & Frank Wolf (1998).
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. 377-378 .
- Ulises Guzmán: Catálogo de cactáceas mexicanas . Universidad National Autonoma de México, Mexico City 200, ISBN 970-9000-20-9 , pp. 121 .
Individual evidence
- ↑ Description of some new nopaleas. In: Nova Acta Physico-Medica Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum Exhibentia Ephemerides sive Observationes Historias et Experimenta…. Volume 16, number 1, 1832, p. 340. ( Textarchiv - Internet Archive )
- ↑ Werner Reppenhagen : The genus Mammillaria . tape 1 . Steinhart, Titisee Neustadt 1991, OCLC 633031656 , p. 120 .
- ↑ DR Hunt: Mammillaria Postscripts. Volume 6, 1997 p. 9.
- ↑ Mammillaria crucigera in the IUCN Red List of Threatened Species 2013.2. Posted by: Arias, S., Valverde, T. & Zavala-Hurtado, A., 2009. Retrieved December 27, 2013.
Web links
- Plant photos and distribution at Mammillarias.net