Gymnocalycium riojense

Gymnocalycium riojense
	Gymnocalycium riojense subsp. piltziorum
Systematics
Order :	Clove-like (Caryophyllales)
Family :	Cactus family (Cactaceae)
Subfamily :	Cactoideae
Tribe :	Trichocereeae
Genre :	Gymnocalycium
Type :	Gymnocalycium riojense
Scientific name
	Gymnocalycium riojense
	Frič ex H.Till & W.Till

Gymnocalycium riojense is a species of plant in the genus Gymnocalycium from the cactus family(Cactaceae).

description

Gymnocalycium riojense grows individually with dull green to brownish green, flattened spherical shoots and reaches heights of 1 to 8 centimeters with diameters of 8 to 10 centimeters (rarely up to 20 centimeters). The ten to 13 (rarely up to 28) straight ribs are barely humped. There is never a central spine . The three to seven light brown radial spines have a darker tip and lie on the surface of the shoot. One of them is directed downwards, the rest sideways. They are 0.9 to 1.5 inches long.

The short tubular to funnel-shaped, whitish to slightly pale pink flowers have a dark throat. They reach a length of up to 4.8 centimeters and a diameter of 4 centimeters. The barrel-shaped to egg-shaped fruits are brown-green to olive-green and slightly glaucous . They are about 2.6 inches long and 1.3 to 1.8 inches in diameter.

Distribution and systematics

Gymnocalycium riojense is widespread in the Argentine provinces of Catamarca and La Rioja at altitudes of 450 to 1500 meters.

The first description was in 1991 by Hans and Walter Till . The following subspecies are distinguished:

Gymnocalycium riojense subsp. riojense
Gymnocalycium riojense subsp. kozelskyanum Schütz ex H.Till & W.Till
Gymnocalycium riojense subsp. paucispinum Backeb. ex H.Till & W.Till
Gymnocalycium riojense subsp. piltziorum Schütz ex H.Till & W.Till

proof

literature

Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 325 .

Individual evidence

^ Hans Till, Walter Till: Gymnocalycium riojense: Validation, description of new taxa and systematic grouping according to morphological and areal-geographic criteria (part 1) . In: Gymnocalycium . Volume 4, Number 2, 1991, pp. 47-49.

Web links

Commons : Gymnocalycium riojense - collection of pictures, videos and audio files

[1] Hans Till, Walter Till: Gymnocalycium riojense: Validation, description of new taxa and systematic grouping according to morphological and areal-geographic criteria (part 1) . In: Gymnocalycium . Volume 4, Number 2, 1991, pp. 47-49.