Thelocactus tulensis
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| ( Poselg. ) Britton & Rose |
Thelocactus tulensis is a species of Thelocactus in the cactus family(Cactaceae). The specific epithet indicates the Mexican site near Tula in the state of Tamaulipas .
description
Thelocactus tulensis grows solitary, spherical, sometimes a little elongated and has a dark, matt green body up to 25 centimeters high and 8 centimeters in diameter. The 10 ribs are bulbous to conical, up to 2 centimeters high and in diameter. The warts are very thick, fleshy and polygonal. The areoles are woolly 2.5 centimeters apart when young, later bare. The 6 to 8 radial spines are first brownish then white and only 1 to 1.5 centimeters long. The 1 to 3 central spines are up to 4 inches long, straight or curved, whitish to horn-colored with a dark tip.
The flowers are widely spread, 2.5 to 5 inches long and 3.5 to 8 inches in diameter. The flower color varies from silvery white to pale pink, with a central stripe carmine red. The scar is pale yellow. The fruits are green to greenish-magenta or whitish-brown; they are 11 to 18 millimeters long and about 7 to 10 millimeters in diameter. The seeds are dark with finely humped testa .
Distribution, systematics and endangerment
Thelocactus tulensis is native to the Mexican states of Tamaulipas , Nuevo León and San Luis Potosí .
It was first described as Echinocactus tulensis in 1853 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 .
The following subspecies are distinguished:
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Thelocactus tulensis subsp. bueckii (Klein) NPTaylor :
It was first described as Echinocactus buekii in 1859 by Edward Emanuel Klein . Nathaniel Lord Britton and Joseph Nelson Rose placed them in the genus Thelocactus in 1923 . Nigel Paul Taylor introduced it in 1998 as a subspecies to Thelocactus tulensis . Solitary subspecies with magenta to dark red flowers from Nuevo León at an altitude of 1200 to 1800 meters. -
Thelocactus tulensis subsp. matudae (Sánchez-Mej. & ABLau) NPTaylor :
The first description was in 1978 by Hernándo Sánchez-Mejorada and Alfred Bernhard Lau as Thelocactus matudae . Nigel Paul Taylor introduced it in 1998 as a subspecies to Thelocactus tulensis . Compressed spherical to weakly columnar, individually growing plants with purple-red flowers from Nuevo León, where it occurs at heights of 800 to 1000 meters. -
Thelocactus tulensis subsp. tulensis (Poselger) Britton & Rose :
Very variable in the number of ribs and warts. The nominate form occurs at altitudes between 800 and 1400 meters.
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. 662-663 .
- Ulises Guzmán, Salvador Arias, Patricia Dávila: Catálogo de cactáceas mexicanas . Universidad Nacional Autónoma de México, Mexico City 2003, ISBN 970-9000-20-9 , pp. 232 .
Individual evidence
- ^ H. Poselger: Contribution to the cactus customer . In: General garden newspaper . Volume 21, Number 16, 1853, p. 125, (online) .
- ↑ a b N. L. 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 ).
- ↑ Small: garden flora . Volume 8, 1859, p. 257.
- ↑ a b N. P. Taylor: Cactaceae Consensus Initiatives . Volume 5, 1998, p. 14.
- ^ Sánchez-Mejorada, Lau: Cactaceas y Suculentas Mexicanas . Volume 23, 1978, 51-52.
- ↑ Thelocactus tulensis 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.
