Thelocactus rinconensis

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Thelocactus rinconensis
Thelocactus rinconensis subsp. rinconensis

Thelocactus rinconensis subsp. rinconensis

Systematics
Order : Clove-like (Caryophyllales)
Family : Cactus family (Cactaceae)
Subfamily : Cactoideae
Tribe : Cacteae
Genre : Thelocactus
Type : Thelocactus rinconensis
Scientific name
Thelocactus rinconensis
( Poselg. ) Britton & Rose
Typical bloom
blossom

Thelocactus rinconensis is a species of Thelocactus in the cactus family(Cactaceae). The specific epithet indicates the first site at La Rinconada in the Mexican state of Nuevo León .

description

Thelocactus rinconensis always grows individually spherically depressed. The gray-green body is 6 to 8 centimeters high and 12 to 20 centimeters in diameter, is bumpy at the apex and covered with sparse wool felt. The up to 20  ribs are thick and bumpy. The tubercles are conical, angular, straight or crookedly truncated. The areoles are 2 to 2.5 centimeters apart, circular or elliptical and covered with white wool felt. Radial spines are completely absent in the nominate form . The number and color of the thorns vary very often. The 3 to 4  central spines are 6 to 8 inches long, needle-shaped, sub-like and colored yellow-ocher to greyish.

The flowers are large, widely spread, 4 to 7 inches long and wide. The flower color varies from white, yellowish to purple-pink.

Distribution, systematics and endangerment

Thelocactus rinconensis grows on limestone hills in the Mexican states of Coahuila and Nuevo León in very small populations in limited areas.

It was first described as Echinocactus rinconensis in 1855 by Heinrich Poselger . Nathaniel Lord Britton and Joseph Nelson Rose placed them in the genus Thelocactus in 1923 . There are a lot of invalid double descriptions and recombinations and a multitude of synonyms . Synonyms include Echinocactus lophothele Salm-Dyck (1850) and Echinocactus phymatothelos Poselg. ex Rümpler (1886).

The following subspecies are distinguished:

  • Thelocactus rinconensis subsp. rinconensis ( Poselger ) Britton & Rose :
    The nominate form has no radial spines. It has 3 to 5 central spines; Flowers are usually white, sometimes reddish.
  • Thelocactus rinconensis subsp. multicephalus Luethy :
    White to pink flowers with a darker central stripe
  • Thelocactus rinconensis subsp. hintonii Luethy :
    The first description was made by Adrian Lüthy . Occurs only in a small area west of Rayones. The flowers are mainly yellow. The subspecies has 0 to 6 radial spines that are ocher yellow to greyish and slightly curved.

The two subspecies Thelocactus rinconensis subsp. Accepted by Alessandro Mosco and Carlo Zanovello in 2000 . freudenbergeri (R. Haas) Mosco & Zanov. and Thelocactus rinconensis subsp. nidulans (Quehl) Glass , which differ in their area of ​​distribution, thorns and flower color, are synonyms for Thelocactus rinconensis .

In the Red List of Threatened Species of the IUCN , the species is listed 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. 662 .
  • Alwin Berger : Cacti - instructions for culture and knowledge of the most important introduced species . Eugen Ulmer, Stuttgart 1929, p. 255 .
  • Ulises Guzmán, Salvador Arias, Patricia Dávila: Catálogo de cactáceas mexicanas . Universidad Nacional Autónoma de México, Mexico City 2003, ISBN 970-9000-20-9 , pp. 313 .
  • Carl Friedrich Förster : Handbuch der Cacteenkunde in its full scope: Or the most successful cultural information based on the latest experiences, as well as a detailed and precise description and corrected synonymy of all cacti that have become known up to now, and everything in general with regard to these ... Wöller, 1846, S. 602 ( online ).
  • Karl Schumann : Complete description of the cacti (Monographia cactacearum) . J. Neumann, Neudamm 1899, p. 433 ( online ).

Individual evidence

  1. ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, ISBN 3-540-00489-0 , p. 203.
  2. ↑ H. Poselger: Allgemeine Gartenzeitung , vol. 23, 1866, p. 18
  3. ^ 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. 7 ( online ).
  4. ↑ A. Lüthy, Kakteen und other Succulents Vol. 48, 1997, p. 39
  5. ↑ Alessandro Mosco, Carlo Zanovello: A phenetic analysis of the genus Thelocactus . In: Bradleya , Volume 18, 2000, p. 48.
  6. ^ A. Mosco, c. Zanovello: Nomenclatural adjustments in Thelocactus and Turbinicarpus . In: Cactaceae Consensus Initiatives . Volume 7, 1999, p. 18.
  7. ^ EC Glass: Identification guide to threatened cacti of Mexico . Fideicomiso Fondo para la Biodiversidad, 1997.
  8. ↑ Thelocactus rinconensis in the IUCN Red List of Threatened Species 2013.2. Posted by: Gómez-Hinostrosa, C., Hernández, HM, Sotomayor, M. & Smith, M., 2009. Retrieved December 14, 2013.

Web links

Commons : Thelocactus rinconensis  - Collection of images, videos and audio files