Coryphantha retusa

Coryphantha retusa
	Coryphantha retusa
Systematics
Order :	Clove-like (Caryophyllales)
Family :	Cactus family (Cactaceae)
Subfamily :	Cactoideae
Tribe :	Cacteae
Genre :	Coryphantha
Type :	Coryphantha retusa
Scientific name
	Coryphantha retusa
	Britton & Rose

Coryphantha retusa is a species of plant in the genus Coryphantha from the cactus family(Cactaceae). The specific epithet retusa comes from Latin , means 'blunted' and refers to the shape of the warts.

description

Coryphantha retusa grows individually with flattened spherical to short cylindrical, cloudy green shoots , which reach heights of 3 to 7 centimeters with diameters of 5 to 10 centimeters. The warts , up to 8 millimeters long, are unevenly swollen. The axils and furrows on the warts are initially covered with wool and later bald. Central spines are not developed. The six to twelve whitish yellow radial spines turn gray with age. They are flattened, arranged in a comb, and 0.9 to 2 inches long. With the exception of the topmost, they are subordinate.

The bell-shaped, yellow flowers reach lengths of 3.5 to 5 centimeters and diameters of 4 to 5 centimeters. The ellipsoidal green fruits are up to 3 centimeters long.

Distribution, systematics and endangerment

Coryphantha retusa is common in the Mexican states of Oaxaca and Puebla on grassland on lava soil.

The first description by Nathaniel Lord Britton and Joseph Nelson Rose was published in 1923. Reto F. Dicht and Adrian D. Lüthy proposed in 2000 that the name Coryphantha retusa should be preserved and that the dubious name Mammillaria retusa established by Ludwig Georg Karl Pfeiffer in 1837 should be rejected.

Synonyms are Melocactus mammillariiformis Salm-Dyck (1836, discarded name ICBN -Article 56.1?), Mammillaria mammillariiformis (Salm-Dyck) Salm-Dyck (1850), Mammillaria cephalophora Salm-Dyck (1850), Echinocactus cephalophora ( ) Salmelgophora () . (1853, nom. Illeg.) And Cactus cephalophora (Salm-Dyck) Kuntze (1891, nom. Illeg.).

In the Red List of Threatened Species of the IUCN , the species is called " Data Deficient (DD) ", i. H. with insufficient data.

proof

literature

Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 158-159 .

Individual evidence

↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Springer, Berlin / Heidelberg 2010, ISBN 978-3-642-05597-3 , p. 202.
^ NL Britton , JN Rose : The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family . tape IV . The Carnegie Institution of Washington, Washington 1923, p. 38-39 ( online ).
^ Reto F. Dicht, Adrian D. Lüthy: Nomina Cactacearum Conservanda sive Rejicienda Proposita . In: Cactaceae Systematics Initiatives . Number 10, 2000, pp. 19-22.
↑ Dr. Pfeiffer: Description of some new cacti . In: General garden newspaper . Volume 5, Number 47, 1837, pp. 369-370 ( online ).
^ Coryphantha retusa in the Red List of Threatened Species of the IUCN 2013.2. Posted by: Arias, S., 2009. Retrieved December 14, 2013.

Web links

Commons : Coryphantha retusa - collection of images, videos and audio files

Photo by Coryphantha retusa

[1] Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Springer, Berlin / Heidelberg 2010, ISBN 978-3-642-05597-3 , p. 202.

[2] NL Britton , JN Rose : The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family . tape IV . The Carnegie Institution of Washington, Washington 1923, p. 38-39 ( online ).

[3] Reto F. Dicht, Adrian D. Lüthy: Nomina Cactacearum Conservanda sive Rejicienda Proposita . In: Cactaceae Systematics Initiatives . Number 10, 2000, pp. 19-22.

[4] Dr. Pfeiffer: Description of some new cacti . In: General garden newspaper . Volume 5, Number 47, 1837, pp. 369-370 ( online ).

[5] Coryphantha retusa in the Red List of Threatened Species of the IUCN 2013.2. Posted by: Arias, S., 2009. Retrieved December 14, 2013.