Discaria
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Discaria chacaye |
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| Scientific name | ||||||||||||
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Discaria is a genus from the family of Buckthorn family (Rhamnaceae). The representatives often form thorny bushes or small trees. The range of the species is in South America, Australia and New Zealand.
description
The species of the genus Discaria form prostrate to upright, leafy or almost leafless, often thorny shrubs or trees up to 8 meters high. The leaf bases converge towards the stem. The inflorescences are cymes of one to three, rarely up to six flowers . The flowers are mostly hermaphroditic, rarely unisexual, four or five-fold, rarely six-fold. The flower cup is bell-shaped or urn-shaped and falls off early. Petals are present or may be absent. The anthers are usually four-compartment. The disc is ring-shaped, more or less strongly lobed and surrounds the ovary at the base of the fruit cup. The ovary is semi-subordinate and triple. Capsules are formed as fruits , which break open explosively.
distribution
The natural range of the eight species according to Kubitzki is in the southern hemisphere, five species grow in South America ( e.g. Discaria chacaye ), two ( Discaria nitida and Discaria pubescens ) in Australia and one in New Zealand ( Discaria toumatou ).
Systematics and research history
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Discaria is a genus from the family of the Buckthorn family (Rhamnaceae), in which they are of the tribe Colletieae is assigned. William Jackson Hooker first scientifically described the genus in his Botanical Miscellany in 1829 . Synonyms of the genus are Chacaya Escal. and Notophaena Miers .
According to Kubitzki, eight types are distinguished; the Plant List indicates the following types:
- Discaria americana Gillies & Hook.
- Discaria articulata (Phil.) Miers
- Discaria chacaye (G.Don) Tortosa : It occurs in Argentina and Chile.
- Discaria nitida Tortosa
- Discaria pubescens (Brongn.) Druce
- Discaria serratifolia Benth. & Hook.f. ex mast. (a hybrid according to the Plant List)
- Discaria toumatou Raoul
Individual evidence
- ↑ a b c D. Medan, C. Schiarend: Rhamnaceae in Klaus Kubitzki: The Families and Genera of Vascular Plants , Volume VI, p. 329
- ↑ a b c d e Discaria in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
- ^ GJ Harden: Genus Discaria. In: New South Wales Flora. PlantNet, accessed November 20, 2015 .
- ↑ Discaria. In: The International Plant Name Index. Retrieved November 20, 2014 .
- ↑ Discaria. In: The Plant List. Retrieved November 20, 2014 .
literature
- Klaus Kubitzki (Ed.): The Families and Genera of Vascular Plants . Volume 6: Flowering Plants, Dicotyledons: Celastrales, Oxalidales, Rosales, Cornales, Ericales . Springer, Berlin / Heidelberg / New York 2004, ISBN 3-540-06512-1 , pp. 329 (English).
Web links
- GJ Harden: Genus Discaria. In: New South Wales Flora. PlantNet, accessed November 20, 2015 .