Socotrella dolichocnema

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Socotrella dolichocnema
Systematics
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Ceropegieae
Sub tribus : Stapeliinae
Genre : Socotrella
Type : Socotrella dolichocnema
Scientific name of the  genus
Socotrella
Bruyns & AGMill.
Scientific name of the  species
Socotrella dolichocnema
Bruyns

Socotrella dolichocnema is the only plant species of the monotypical genus Socotrella from the subfamily of the silk plants (Asclepiadoideae). The first description of Socotrella dolichocnema was in 2002 by Peter Vincent Bruyns , he described the genus together with Anthony G. Miller . The botanical name of the genus refers to the occurrence on the island of Socotra .

description

Socotrella dolichocnema grows as a small, somewhat rhizomatous succulent plant . The square, more or less right-angled, dark green, prostrate shoots are 5 to 15 centimeters long and 4 to 7 millimeters thick. Your warts have a 1 to 2 millimeter long tooth-shaped fork at their upper end. There are no leaf rudiments or stipular teeth.

On each shoot, several inflorescences are formed near the tip of the shoot , these have one to five flowers that open one after the other. Around the base of the 2.5 to 4.2 centimeters long and about 1 millimeter thick, ascending flower stalk are 1 to 2 millimeters long, pointed bracts . The ovate-lanceolate, sharply pointed sepals are about 1.5 millimeters long and 0.5 millimeters wide at their base. The flat, bell-shaped corolla is light yellow-green on the outside, glabrous and smooth. Inside it is yellow with broad, reddish, elongated markings, glabrous and finely papillary. It measures 18 to 22 millimeters in diameter. The corolla tube is 2 millimeters long and 5 to 6 millimeters wide. The blunt, slightly convex corolla lobes are 7 to 8 millimeters long and 3 to 4 millimeters wide at their base. The secondary crown has a length of 2 millimeters and the same width. Their outer tips are reduced to tiny lobes below the guardrails. The inner lobes are upright, about 0.5 millimeters long and lie on the back of the stamens . Your ellipsoid pollinium is significantly longer than it is wide.

Spread and endangerment

Socotrella dolichocnema is widespread in the area of ​​the "Western Plateau" of the island of Socotra, which belongs to Yemen, at altitudes of 660 meters. The species is classified as endangered (" Vulnerable (VU) ") in the IUCN's Red List of Endangered Species .

proof

literature

  • PV Bruyns, AG Miller: Socotrella, a New Genus of Stapeliad (Apocynaceae-Asclepiadoideae) from the Island of Socotra . In: Novon . Volume 12, Number 3, 2002, pp. 330-333 (JSTOR) .
  • Pavel Hanácek, Miroslav Ricánek: In search of Socotrella . In: Cactus and Succulent Journal . Volume 78, number 1, 2006, pp. 6-9, doi : 10.2985 / 0007-9367 (2006) 78 [6: ISOS] 2.0.CO; 2 .
  • Ulrich Meve: Baynesia and Socotrella - still little known taxa of the Stapeliinae . In: Cacti and other succulents . Volume 60, Number 8, 2009, pp. 211-214.

Individual evidence

  1. ↑ Socotrella dolichocnema in the endangered Red List species the IUCN 2011. Posted by: Miller, A., 44,770th Accessed December 3, 2011 ..

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