Pediocactus peeblesianus
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Pediocactus peeblesianus |
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| ( Croizat ) LDBenson |
Pediocactus peeblesianus is a species of the genus Pediocactus in the cactus family(Cactaceae). The specific epithet honors the American botanist and agricultural scientist Robert Hibbs Peebles (1900–1956). English trivial names are “Navajo Cactus”, “Peeble's Cactus”, “Peeble's Hedgehog Cactus” and “Peeble's Navajo Cactus”.
description
The individual, spherical to egg-shaped, gray-green plant bodies are 1.5 to 5 cm long and 2 to 3.5 cm in diameter. On them there are cylindrical warts 2 to 6 mm long and 2 to 6 mm wide. The characteristic corky, torn, white to gray central thorn , which can also be missing, arises from the round areoles . The three to four (rarely 6), cross-shaped arranged radial spines of the same color and texture are 2 to 10 mm long.
The funnel-shaped flowers , which appear unevenly at the apex, are 1 to 2.5 cm long and 2 cm in diameter. The bracts are yellow, cream-colored to brownish and have a brown central stripe. The flowering period is from April to May.
The spherical green to reddish-brown fruits are 6 mm in diameter and contain around 5 to 10 dark brown to black seeds that ripen within 4 months.
The plants withdraw into the ground during the resting phases ( geophyte ).
distribution
Pediocactus peeblesianus is one of the rarest and smallest species of cactus in the United States . The species grows endemically in Arizona in Navajo County on gravelly hills at altitudes of 1450 m to 1600 m and is associated with Sclerocactus whipplei , Echinocactus polycephalus and other Opuntia and Yucca species.
Systematics
The first plants were discovered in 1935 by Whittacker, who worked for the Arizona Highway Department, near Holbrook , central Arizona. 1943 took place under the name Navajoa peeblesiana the first description by Léon Croizat . Lyman David Benson placed the species in the genus Pediocactus in 1962 .
Fritz Hochstätter distinguished three subspecies in his treatment as a monotypical genus Navajoa 2007 :
- Navajoa peeblesiana subsp. peeblesiana
- Navajoa peeblesiana subsp. fickeiseniorum (Hochstätter) Hochstätter
- Navajoa peeblesiana subsp. menzelii (Hochstätter) Hochstätter
Synonyms are:
- Navajoa peeblesiana Croizat (1943, incorrect name ICBN -Article 11.4)
- Toumeya peeblesiana (Croizat) WTMarshall (1947)
- Echinocactus peeblesianus (Croizat) LDBenson (1950)
- Utahia peeblesiana (Croizat) Kladiwa (1969)
- Neonavajoa peeblesiana (Croizat) Doweld (1999)
Danger
The species and all of its subspecies are threatened and have been included in Appendix I of the Washington Convention for the Protection of Endangered Species. In the Red List of Threatened Species of the IUCN , the species is listed as " Least Concern (LC) ". H. listed as not endangered.
literature
- Fritz Hochstätter: The Genera Pediocactus, Navajoa, Toumeya . English with a German summary. Selbstverlag, 2007, pp. 41–43, pp. 356–357, photo material p. 230–237, p. 280, distribution map p. 291, first description p. 329–330. ISBN 978-3-000212444 .
Individual evidence
- ^ Léon Croizat: Navajoa, a New Genus in Cactaceae . In: Cactus and Succulent Journal . Volume 15, Number 6, 1943, pp. 88-89.
- ^ Cactus and Succulent Journal . Volume 34, Number 2, 1962, p. 58.
- ^ Leon Croizat: Navajoa, a New Genus in Cactaceae . In: Cactus and Succulent Journal . Volume 15, Number 6, 1943, pp. 88-89.
- ^ Cactus and Succulent Journal . Volume 19, p. 77, 1947
- ^ Lyman David Benson: The Cacti of Arizona 2nd edition, 1950 p. 108.
- ^ In: Hans Krainz : Kakteen . Delivery 40–41, Gen. C VIII b, 1969.
- ↑ Succulent . 1999.
- ↑ Pediocactus peeblesianus in the IUCN Red List of Threatened Species 2013.2. Listed by: Butterworth, C. & Porter, JM, 2010. Retrieved December 29, 2013.
Web links
- Pediocactus peeblesianus with field number list