Thelocactus conothelos
| Thelocactus conothelos | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thelocactus conothelos subsp. conothelos |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Thelocactus conothelos | ||||||||||||
| ( Rule & small to ) Backeb. & FMKnuth |
Thelocactus conothelos is a species of the genus Thelocactus in the cactus family(Cactaceae). The specific epithet conothelos means, from the Greek cone 'cone' and thele 'warts': 'with conical warts'.
description
Thelocactus conothelos always grows solitary, spherical and has a 7 to 18 centimeter high body with a diameter of 7 to 18 centimeters. The ribs are indistinct. The warts are conical to conical, light green square at the base. The areoles are 3 millimeters wide woolly. The 7 to 20 radial spines are glassy, ocher yellow to grayish, straight, needle-shaped and are only 8 to 12 millimeters long. The 4 central spines are between 1 and 9 centimeters long, needle-shaped and colored ocher yellow to greyish.
The flowers are large, widely spread, 4.5 to 6 inches long and wide. The flower color varies from white to magenta. The fruits are often 12 millimeters long and about 7 millimeters in diameter, jumping up at the base. The seeds are very dark reddish to purple to black with finely tuberous testa.
Distribution, systematics and endangerment
Thelocactus conothelos is the most common taxon. It grows in the Mexican states: Tamaulipas , Nuevo León and San Luis Potosí .
It was first described as Echinocactus conothelos in 1860 by Eduard August von Regel and Edward Emanuel Klein . Curt Backeberg and Frederik Marcus Knuth placed them in the genus Thelocactus in 1936 . There are a lot of invalid double descriptions and recombinations and a multitude of synonyms .
The following subspecies are distinguished:
-
Thelocactus conothelos subsp. conothelos ( rule & small) Backeb. & FMKnuth :
The flowers are usually magenta, sometimes white. -
Thelocactus conothelos subsp. argenteus ( Glass & Foster) Glass :
The first description was by Charles Edward Glass and Michael Foster as Thelocactus conothele var. argenteus . In 1997, Charles Edward Glass recombined it as a subspecies to Thelocactus conothelos . Plants with very light thorns and pink flowers from Nuevo León. -
Thelocactus conothelos subsp. aurantiacus Glass & Foster :
It was first described by Charles Edward Glass and Michael Foster as Thelocactus conothele var. aurantiacus . In 1997, Charles Edward Glass recombined it as a subspecies to Thelocactus conothelos . Plants with dark thorns and yellow flowers from Nuevo León.
The subspecies Thelocactus conothelos subsp. Accepted by Alessandro Mosco and Carlo Zanovello in 2000 . garciae (Glass & M. Mendoza) Mosco & Zanov. , which differs in area of distribution, thorns and flower color, is considered a synonym for Thelocactus conothelos .
In the Red List of Threatened Species of IUCN , the subspecies was in 2002 Thelocactus conothelos subsp. argenteus as " Critically Endangered (CR) ", d. H. classified critically endangered. Thelocactus conothelos subsp. aurantiacus was considered " Endangered (EN) " in 2002 , i. H. endangered. In the 2009 update, the subspecies was not re-evaluated and removed from the red list. The species is now collectively referred to as " Least Concern (CR) ". H. listed as not endangered.
proof
literature
- Edward F. Anderson : The Cactus Family . Timber Press, Portland (Oregon) 2001, ISBN 0-88192-498-9 , pp. 658 .
- Alwin Berger : Cacti - instructions for culture and knowledge of the most important introduced species . Eugen Ulmer, Stuttgart 1929, p. 257 .
- 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. 13 ( 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. 312 .
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names. Birkhäuser, 2004, ISBN 3-540-00489-0 , p. 53.
- ^ Rule & Small: Index Seminum [St. Petersburg] . 1860, p. 48
- ^ Backeberg, F. Knuth: Kaktus-ABC , 1936, p. 358.
- ^ A b Glass, Foster: Cactus and Succulent Journal (US) . Volume 44, 1972, p. 48.
- ↑ a b Glass: Ident-No. Guide to endangered cacti of Mexico . Volume 1: TH / CON, 1997.
- ↑ Alessandro Mosco, Carlo Zanovello: A phenetic analysis of the genus Thelocactus . In: Bradleya , Volume 18, 2000, p. 48.
- ^ A. Mosco, C. Zanovello: Nomenclatural adjustments in Thelocactus and Turbinicarpus . In: Cactaceae Consensus Initiatives . Volume 7, 1999, p. 18.
- ↑ Thelocactus conothelos in the IUCN Red List of Threatened Species 2013.2. Posted by: Sotomayor, M., Gómez-Hinostrosa, C., Hernández, HM & Smith, M., 2009. Retrieved December 14, 2013.
