Pediocactus bradyi

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Pediocactus bradyi
Pediocactus bradyi specimen in bloom in Arizona.

Pediocactus bradyi
specimen in bloom in Arizona.

Systematics
Order : Clove-like (Caryophyllales)
Family : Cactus family (Cactaceae)
Subfamily : Cactoideae
Tribe : Cacteae
Genre : Pediocactus
Type : Pediocactus bradyi
Scientific name
Pediocactus bradyi
LDBenson
The habitat of Pediocactus bradyi .

Pediocactus bradyi is a species of the genus Pediocactus in the cactus family(Cactaceae). The specific epithet honors the geologist and botanist Lionel Francis Brady , whodiscoveredthe first plants on the Colorado River while searching for fossils. English common names are "Brady Plains Cactus" and "Marble Canyon Cactus"

The species is threatened and was included in Appendix I of the Washington Convention for the Protection of Endangered Species.

description

The green, single, rarely group-forming, plant body is spherical to egg-shaped and reaches heights of 3.5 to 6.2 cm with a diameter of 2.5 to 5 cm. The unbranched root is beet-shaped. On the cylindrical-oval warts there are elliptical, shaggy, white or yellowish areoles from which 1 to 2 central spines very rarely arise. The 6 to 18 irregularly arranged, needle-shaped radial spines are white to yellowish and 5 mm long.

The bell-shaped flowers , which appear irregularly around the apex, are 1.5 to 2 cm long. The bracts are yellow to white. The flowering period is in March. The wide, sinuous fruits are one centimeter long and one centimeter in diameter. They contain 3 to 8 dull, dark brown to black seeds that mature within 4 weeks.

The plants withdraw into the ground during the resting phases ( geophyte ).

Distribution, systematics and endangerment

Pediocactus bradyi grows endemically in Coconino County of Arizona on flat hills covered with limestone gravel at altitudes between 900 and 1,300 meters. It is associated with Sclerocactus parviflorus , Navajoa peeblesiana subsp. fickeiseniorum , Echinocactus polycephalus var. xeranthemoides , Echinocereus engelmannii var. variegatus , Opuntia nicholii , Opuntia basilaris and Yucca species.

The first description was in 1962 by Lyman David Benson .

According to Fritz Hochstätter , the following subspecies are distinguished:

Pediocactus bradyi belongs within the genus Pediocactus to the section Rhytidospermae .

In the Red List of Threatened Species of IUCN is the species as " Near Threatened (NT) ", d. H. listed as low risk.

photos

Pediocactus bradyi :

  • With flower buds.

  • In culture.

  • After the flowering period.

literature

  • Fritz Hochstätter (Ed.): The Genera Pediocactus, Navajoa, Toumeya . English with a German summary. Selbstverlag, 2007, pp. 14–15, p. 343; Photo material pp. 90-95; First description pp. 299–302. ISBN 978-3-00-021244-4 .

Individual evidence

  1. ^ Cactus and Succulent Journal . Volume 34, No. 1, p. 19, 1962.
  2. ↑ Pediocactus bradyi in the IUCN Red List of Threatened Species 2013.2. Listed by: Butterworth, C. & Porter, JM, 2010. Retrieved December 29, 2013.

Web links

Commons : Pediocactus bradyi  - collection of images, videos and audio files