Grusonia reflexispina
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| ( Wiggins & Rollins ) EFAnderson |
Grusonia reflexispina is a species of plant in the genus Grusonia fromthe cactus family (Cactaceae). The specific epithet reflexispina means '(Latin reflexispinus) with backward curved spines'.
description
Grusonia reflexispina grows low, is moderately branched and forms lumps 30 to 100 centimeters in diameter and 20 to 40 centimeters in height, which consist of upright, candelabra-like trunks. The light yellowish green, cylindrical to broadly club-shaped, broadly humped shoot sections are 5 to 10 centimeters long and have a diameter of 0.8 to 1.5 centimeters. The circular to elliptical areoles are covered with white wool and twisted, soon-falling hair . Old areoles are numerous with yellow glochids that are 1 to 7 millimeters long. The two to five thorns are broad, flattened, roughened and thickened onion-shaped at their base. The single upper spine is gray, protruding and 0.6 to 1 centimeter long. The lower fine thorns are gray to almost white, curved backwards and 0.8 to 1.5 centimeters long. The approximately ten radial spines are needle-like to flattened and have a length of 4 to 6 millimeters.
The greenish to yellow flowers appear in groups near the shoot tips and reach lengths of 4 to 6 centimeters. The greenish fruits are dry.
Distribution, systematics and endangerment
Grusonia reflexispina is endemic to a small area near Tastiota in the Mexican state of Sonora .
It was first described as Opuntia reflexispina in 1943 by Ira Loren Wiggins and Reed Clark Rollins . Edward Frederick Anderson placed the species in the genus Grusonia in 1999 . A synonym is Corynopuntia reflexispina (Wiggins & Rollins) Backeb. (1958).
In the Red List of Threatened Species of IUCN is it as " Critically Endangered (CR) , d". H. classified critically endangered. The species is threatened by the agricultural use of the distribution areas. Furthermore, the expansion of shrimp farms and the expansion of roads near the only known distribution area are responsible for land loss. The development of the population is seen as decreasing.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 308 .
Individual evidence
- ^ Contributions from the Dudley Herbarium of Stanford University . Volume 3, 1943, p. 275.
- ^ Cactus and Succulent Journal . Volume 71, Number 6, Cactus and Succulent Society of America, 1999, p. 325.
- ↑ Corynopuntia reflexispina in the IUCN Red List of Threatened Species 2014.3. Posted by: Puente, R., Felger, RS & Baker, M., 2013. Retrieved December 12, 2014.