Thelocactus bicolor
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Thelocactus bicolor subsp. blackii |
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| Thelocactus bicolor | ||||||||||||
| ( Galeotti ex Pfeiff. ) Britton & Rose |
Thelocactus bicolor is a species of the genus Thelocactus in the cactus family(Cactaceae). The specific epithet bicolor comes from Latin and means 'two-colored', which refers to the thorns of the species. English common names are "Glory of Texas", "Straw Spine Cactus" and "Texas Pride".
description
Thelocactus bicolor grows spherical to conical or cylindrical. The body is blue or gray-green, a bit tomentose at the top and often thorny and about 6 to 10 centimeters in diameter. The 8 to 13 ribs are straight or twisted and divided into crooked cusps up to 1.5 centimeters high. The 9 to 18 radial spines are protruding or slightly curved and up to 3 centimeters long. The 1 to 4 central spines are all up to 3 centimeters long and vividly colored, white or reddish in the middle or red at the base and yellow at the tip, increasingly grayish with age. The lowest one is stretched out, sublect; the upper ones upright, flat.
The flowers are large, widely spread, 5 to 8 inches long and up to 10 inches wide with a lashed edge. The fruits are reddish brown scaly and edible.
Thelocactus bicolor is a very variable species in terms of color and density. It is therefore also known as the two-colored thelocactus .
Distribution, systematics and endangerment
Thelocactus bicolor is distributed in the southern United States in the state of Texas and in the Mexican states of Chihuahua , Coahuila , Durango , Nuevo León and Tamaulipas .
It was first described as Echinocactus bicolor in 1848 by Ludwig Georg Karl Pfeiffer . Britton & Rose placed them in the genus Thelocactus in 1922 . There are a lot of invalid double descriptions and recombinations and a multitude of synonyms .
The following subspecies are distinguished:
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Thelocactus bicolor subsp. bicolor ( Galeotti ex Pfeiffer ) Britton & Rose :
has magenta-colored (rarely white) flowers. -
Thelocactus bicolor subsp. flavidispinus ( Backeb. ) NPTaylor :
The first description was made by Curt Backeberg as Thelocactus bicolor var. flavidispinus The recombination was carried out by Nigel Paul Taylor . The plants can even grow up to 40 centimeters high and 20 centimeters in diameter. -
Thelocactus bicolor subsp. schwarzii ( Backeb. ) NPTaylor :
The first description was by Curt cheek mountain as Thelocactus schwarzii . The recombination was carried out by Nigel Paul Taylor . Plants without (rarely with a) central spine and pale red to magenta colored flowers.
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 Cactus Family . Timber Press, Portland (Oregon) 2001, ISBN 0-88192-498-9 , pp. 657 .
- Alwin Berger : Cacti - instructions for culture and knowledge of the most important introduced species . Eugen Ulmer, Stuttgart 1929, p. 256 .
- 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. 11 ( 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. 227 .
- 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. 587 ( online ).
- Karl Schumann : Complete description of the cacti (Monographia cactacearum) . J. Neumann, Neudamm 1899, p. 302 ( online ).
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, ISBN 3-540-00489-0 , p. 26.
- ↑ Descr. Cacteen , 2: pl. 25 1848
- ^ NL Britton, JN Rose: Two new genera of Cactaceae . In: Bulletin of the Torrey Botanical Club . Volume 49, 1922, p. 251 ( online ).
- ^ Curt Backeberg, Contributions to Succulents and Care , 6: 1941
- ↑ a b N.P. Taylor, CCI 5: 14, 1998
- ^ Curt Backeberg, Cactus and Succulent Journal of Gr. Brit. 12: 81 1950
- ↑ Thelocactus bicolor in the IUCN Red List of Threatened Species 2013.2. Posted by: Goettsch, BK, Heil, K., Terry, M. & Corral-Díaz, R., 2009. Accessed December 14, 2013.
