Cylindropuntia davisii
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Cylindropuntia davisii |
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| ( Engelm. & JMBigelow ) FMKnuth |
Cylindropuntia davisii is a species of plant in the genus Cylindropuntia in the cactus family(Cactaceae). The specific epithet honors the English botanist from Edinburgh Peter H. Davis (1918–1992).
description
Cylindropuntia davisii has a shrubby growth, is branched in dense whorls and reaches heights of 25 to 60 centimeters. The roots have elongated, bulbous swellings. On the slightly sloping, light green, 4 to 6 centimeters long and 0.8 to 1 centimeter in diameter shoot sections there are clearly recognizable bumps. The tan-colored woolen areoles have yellow glochids 2 to 4 millimeters long . The seven to 13 thorns , occasionally up to 21, are present on almost all areoles. They are spread out, circular to flattened in cross-section, yellow to reddish brown to blackish, have a yellow tip and are 1.5 to 5 centimeters long. The loosely fitting sheaths of the thorns are yellow to tan.
The flowers are yellowish green. The yellow, top-shaped fruits are fleshy and not thorny. They are 2 to 3 centimeters long and 1 to 2 centimeters in diameter. The fruits sometimes proliferate and then form chains.
Distribution, systematics and endangerment
Cylindropuntia davisii is common in grasslands and woodlands in the states of New Mexico , Oklahoma, and Texas in the United States .
The first description as Opuntia davisii by George Engelmann and John Milton Bigelow was published in 1856. Frederik Marcus Knuth placed the species in the genus Cylindropuntia in 1936 . A nomenclature synonym is Opuntia tunicata var. Davisii (Engelm. & JMBigelow) LDBenson (1969).
In the Red List of Threatened Species of the IUCN , the species is listed as " Least Concern (LC) ". H. listed as not endangered. The development of the populations is considered stable.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 170-171 .
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, ISBN 3-540-00489-0 , p. 61.
- ↑ George Engelmann, John Milton Bigelow: Description Of The Cactaceae. In: Route near the thirty-fifth parallel explored by Lieutenant AW Whipple, Topographical Engineers, in 1853 and 1854 . Volume 4, Part 5, Report Of The Botany Of The Expedition, B. Tucker, Washington 1856, p. 49 (online) .
- ↑ Cactus ABC . 1936, p. 124.
- ↑ Cylindropuntia davisii in the IUCN Red List of Threatened Species 2014.1. Posted by: Heil, K., Terry, M. & Corral-Díaz, R., 2013. Retrieved June 12, 2014.