Medium periwinkle
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Medium periwinkle ( Vinca difformis ) |
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The middle periwinkle ( Vinca difformis ) is a species of the genus periwinkle ( Vinca ) in the family of the dog poison plants (Apocynaceae).
features
The middle periwinkle is an evergreen subshrub with a creeping, up to 2 meters long shoot that is rooted at the nodes. On the shoot, sterile, prostrate side branches and upright flower sprouts form, which reach heights of 50 centimeters. The leaves are opposite, short-stalked, ovate, glabrous at the edges and have a length of 2.5 to 7 centimeters. The flowers are stalked and arranged individually in the upper leaf axils. The calyx is permanent, the calyx lobes are subpulate, 5 to 14 millimeters long and glabrous. The crown is pale purple and 3 to 4.5 inches wide. The corolla tube is up to 18 millimeters long, funnel-shaped and has 5 corolla lobes that are spread out flat, cut off at an oblique angle and up to 16 millimeters long.
The flowering period extends from February to May.
The number of chromosomes is 2n = 46.
Occurrence
The middle periwinkle occurs in the western Mediterranean area with Algeria and Morocco east to Italy. It is naturalized in the Azores. It grows in shady, moist places and in hedges.
Systematics
One can distinguish between two subspecies:
- Vinca difformis subsp. difformis : It occurs in the central Mediterranean area and on the Azores.
- Vinca difformis subsp. sardoa Stearn (Syn .: Vinca sardoa (Stearn) Pignatti ): It occurs in Sardinia. It differs from the subsp. difformis by tiny hairs on the leaf margins and calyx tips and by flowers 6–7 centimeters wide.
literature
- Ehrentraud Bayer, Karl-Peter Buttler , Xaver Finkenzeller, Jürke Grau: Plants of the Mediterranean (The Colored Nature Guide). Mosaik Verlag GmbH, Munich 1986.
Individual evidence
- ↑ Vinca difformis at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ^ K. Marhold (2011): Apocynaceae. - In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity. Datasheet Vinca difformis
- ↑ a b c Rafaël Govaerts (Ed.): Vinca - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on November 12, 2017.
- ↑ Peter Schönfelder , Ingrid Schönfelder: The new cosmos Mediterranean flora. Franckh Kosmos Verlag Stuttgart 2008. ISBN 978-3-440-10742-3 . P. 84.
Web links
- Thomas Meyer, Michael Hassler: Mediterranean and Alpine flora. [1]