Pediocactus sileri
| Pediocactus sileri | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pediocactus sileri in flower in Arizona |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Pediocactus sileri | ||||||||||||
| ( Engelm. Ex JMCoult. ) LDBenson |
Pediocactus sileri is a species of the genus Pediocactus in the cactus family(Cactaceae). The specific epithet of the species AL Siler, who discovered the first plants. English common names are "Gypsum Cactus" and "Siler's Pincushion Cactus".
The species is threatened and was included in Appendix I of the Washington Convention for the Protection of Endangered Species.
description
The gray to blue-green, mostly single, sometimes group-forming plant body is spherical to ovoid and becomes cylindrical with age. It reaches heights of growth of 5 to 20 cm (rarely 30 cm) and a diameter of 5 to 12 cm. On the conical warts there are round to oval, woolly, cream-colored to gray areoles from which 4 to 8 1.5 to 3 cm long central spines arise. The 10 to 16 needle-shaped, irregularly arranged radial spines are white to gray and 1 to 2 cm long.
The funnel-shaped flowers appear around the apex and are up to 2.5 cm in length and diameter. Usually the bracts are yellow to brownish, rarely pink. The flowering period is April to May. The cylindrical to oval fruits are 1.2 cm long and 8 mm in diameter. They contain 3 to 15 gray, brown to almost black seeds that mature within 4 to 6 weeks.
Distribution, systematics and endangerment
Pediocactus sileri is endemic to the border area of Arizona and Utah in the counties Mohave , Coconino , Washington and Kane at altitudes between 800 and 1500 meters. It grows in a substrate containing gypsum on flat hills and is associated with Sclerocactus parviflorus , Navajoa peeblesiana subsp. fickeiseniorum , Escobaria vivipara var. arizonica and various Opuntia and Yucca species.
The first description was in 1896 by the American botanist John Merle Coulter , who used the name Echinocactus sileri given by George Engelmann . Nathaniel Lord Britton and Joseph Nelson Rose placed this species in 1922 as Utahia sileri in the monotypical genus Utahia they created . Lyman David Benson assigned it to the genus Pediocactus in 1961 under its current name Pediocactus sileri .
Pediocactus sileri is the type species of the Rhytidospermae section , the members of which have the typical, wavy seed structure of the outer testa .
In the Red List of Threatened Species of the IUCN , the species is listed as " Least Concern (LC) ". H. listed as not endangered.
photos
Pediocactus sileri :
On gypsum-based soil (Utah).
Old Protected Specimens (Utah).
Pink blooming specimens are rare.
An old group.
A group with dense thorns (Utah).
In culture in Europe.
literature
- Fritz Hochstätter (Ed.): The Genera Pediocactus, Navajoa, Toumeya . English with a German summary. Selbstverlag, 2007, pp. 12-13, p. 342; Photo material pp. 82-89. ISBN 978-3-00-021244-4 .
Individual evidence
- ^ Contributions from the United States National Herbarium . Volume 3, Number 7, April 1, 1896, p. 376, (online) .
- ^ NL Britton, JN Rose: The Cactaceae . Descriptions and Illustrations of Plants of the Cactus Family . Washington 1922, Volume 3, p. 215.
- ^ Cactus and Succulent Journal . Volume 33, Number 2, 1961, p. 53.
- ↑ Pediocactus sileri in the Red List of Threatened Species of the IUCN 2013.2. Listed by: Butterworth, C. & Porter, JM, 2010. Retrieved December 29, 2013.
Web links
- Pediocactus sileri with field number list