Cleistocactus acanthurus
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Cleistocactus acanthurus |
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| Cleistocactus acanthurus | ||||||||||||
| ( Vaupel ) DRHunt |
Cleistocactus acanthurus is a species of plant in the genus Cleistocactus from the cactus family(Cactaceae). The specific epithet acanthurus comes from the Greek acanthos 'sting'; ourus 'dig, furrow'; related to the ribbed ribs grooved across by sharp notches.
description
Cleistocactus acanthurus grows as a shrub with prostrate to creeping, ascending or hanging, up to 30 centimeters (rarely up to 50 centimeters) long shoots , which have a diameter of 2 to 5 centimeters. There are 15 to 18 low, rounded ribs , which are divided into indistinct humps by sharp notches . The 2 to 5 (rarely up to 6) central spines are yellowish and up to 1.5 centimeters long. They are difficult to distinguish from the approximately 20 to 40 short, thin, yellowish radial spines.
The straight or slightly curved, crooked, scarlet- red flowers are 4 to 9.5 centimeters long. The spherical fruits reach a diameter of 2 to 2.5 centimeters.
Distribution, systematics and endangerment
Cleistocactus acanthurus is common in the Peruvian regions of Ancash , Lima and Ica at altitudes of 300 to 2500 meters.
It was first described as Cereus acanthurus in 1913 by Friedrich Karl Johann Vaupel . David Richard Hunt placed them in the genus Cleistocactus in 1987 .
According to Carlos Ostolaza , Cleistocactus acanthurus and its subspecies are endangered for their continued existence.
The following subspecies are distinguished:
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Cleistocactus acanthurus subsp. acanthurus :
The nominate form has only 1 to 2 central spines 1.5 to 2.5 centimeters long. The radial spines are thinner. The flowers are 7.5 to 9.5 inches long. -
Cleistocactus acanthurus subsp. faustianus (Backeb.) Ostolaza :
It was first described in 1936 as Borzicactus faustianus by Curt Backeberg . Carlos Ostolaza introduced the species in 1998 as a subspecies to Cleistocactus acanthurus . The subspecies more or less than 6 central spines up to 3 centimeters in length. The 30 to 40 radial spines are up to 1 centimeter long. -
Cleistocactus acanthurus subsp. pullatus (Rauh & Backeb.) Ostolaza :
The first description was in 1957 as Loxanthocereus pullatus by Werner Rauh and Curt Backeberg. Carlos Ostolaza introduced the species in 1998 as a subspecies to Cleistocactus acanthurus . The subspecies has slimmer shoots and significantly smaller flowers.
In the Red List of Threatened Species of IUCN is the species as " Near Threatened (NT)", d. H. listed as low risk. The subspecies were not recorded individually.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 115 .
Individual evidence
- ^ Botanical yearbooks for systematics, plant history and plant geography . Volume 50, Beiblatt 111, Leipzig 1913, pp. 13-14 (online) .
- ↑ David Hunt & Nigel Taylor: New and unfamiliar names of Cactaceae to be used in the European Garden Flora . In: Bradleya . Volume 5, 1987, p. 92.
- ^ Ostolaza, C. A closer look at the conservation status of cacti in the vicinity of Lima, Peru . In British Cactus and Succulent Journal . Vol. 14, Issue 4, 1996, p. 171.
- ^ Curt Backeberg , Frederik Marcus Knuth : Cactus ABC. En haandbog for fagfolk and amatører . Copenhagen 1936, p. 195 .
- ↑ a b Cactaceae Consensus Iniatives . Volume 6, England 1998, p. 8.
- ↑ Meeting reports of the Heidelberg Academy of Sciences , Mathematical and Natural Science Class 315. 1958
- ↑ Cleistocactus acanthurus in the IUCN Red List of Threatened Species 2013.2. Posted by: Ostalaza, C. & Roque, J., 2011. Retrieved February 16, 2014.
