Perrierosedum madagascariense
| Perrierosedum madagascariense | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Perrierosedum | ||||||||||||
| ( A.Berger ) H.Ohba | ||||||||||||
| Scientific name of the species | ||||||||||||
| Perrierosedum madagascariense | ||||||||||||
| ( H.Perrier ) H.Ohba | ||||||||||||
Perrierosedum madagascariense is the only plant species of the monotypic genus Perrierosedum in the family of thick-leaf plants (Crassulaceae). The botanical name of the genus honors the French botanist Joseph Marie Henry Alfred Perrier de la Bâthie and at the same time refers to the similarity with the genus Sedum . The epithet of the species refers to the distribution area Madagascar .
description
Perrierosedum madagascariense forms branched, perennial small shrubs with bare, square shoots and reaches heights of 50 to 80 centimeters. The seated, oppositely arranged leaves are elongated spatulate and 2.5 to 5 inches long and 1.5 to 2.5 inches wide. They are rounded at the tip and long narrowed at the base. The leaf margins are finely notched.
The terminal, five to ten-flowered inflorescence is even zymös. The hermaphrodite flowers are six-fold (rarely five-fold) and obdiplostemon . Your flower stalk is 8 to 10 millimeters long. The free sepals are ovate, rounded at the tip and between 4 and 5 millimeters long. The also free white and red tinged petals are broadly spatulate, convex, five-veined. They are round at the tips and 8 and 10 millimeters long. The upright stamens are 6 and 7 millimeters long. The elongated nectar scales with two columns at the tips are 3 to 3.5 millimeters long.
The fruits are follicles with about 30 ovules per follicle . The seeds are cylindrical, the seed coat is striped lengthways.
Systematics and distribution
Perrierosedum madagascariense is widespread in Madagascar in the Andringitra massif . There the plants were only rediscovered in 2007 and photographed for the first time.
The only species of the genus was in 1923 as Sedum madagascariense of Joseph Marie Henry Alfred Perrier de la Bâthie (1873-1958) first described . Alwin Berger placed it in the Perrierosedum section of the Sedum genus in 1930 . Hideaki Ohba (* 1943) finally raised the section in 1978 to the rank of genus with only one species.
proof
literature
- Urs Eggli (ed.): Succulent lexicon. Crassulaceae (thick leaf family) . Eugen Ulmer, Stuttgart 2003, ISBN 3-8001-3998-7 , pp. 203-204 .
Individual evidence
- ↑ Kelly J. Griffin: The Search for Madagascar's Aloe Andringitrensis . In: Cactus and Succulent Journal . Volume 81, No. 4, pp. 206-209, 2009, doi : 10.2985 / 015.081.0406 .
- ^ Bulletin du Muséum National d'Histoire Naturelle . Volume 29, p. 452, Paris 1923
- ^ Journal of the Faculty of Science, University of Tokyo, Section III. Botany . Volume 12, No. 4, p. 166, Tokyo 1978