Rock rabbit ear
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Rock rabbit's ear ( Bupleurum petraeum ) |
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The rock rabbit ear ( Bupleurum petraeum ) is a species of rabbit ears within the umbelliferae family (Apiaceae). It inhabits the montane to alpine altitude level of the southern and eastern Alps.
description
Vegetative characteristics
The rock hare's ear grows as a perennial, bright green appearing herbaceous plant . Its height varies between 20 and 50 centimeters. It usually has several upright and unbranched stems . At the bottom, these are covered with brownish and thrown-back dead leaf sheaths. The basal, arching, downward-curving leaves are arranged in a lumpy rosette in alternate leaf positions . They sit on the stem axis. The grass-like leaf blade has 9 to 11 parallel nerves. It is linear with a length of 10 to 30 centimeters and a width of 0.3 to 0.5 centimeters. The shorter and wider, lanceolate stem leaves sometimes have an almost heart-shaped base. They embrace the stalk. Usually a single stem leaf is formed per plant.
Generative characteristics
The flowers of the rock rabbit's ear are grouped in double umbels , which have 5 to 15 about 10 centimeters long rays. The thick rays are shaped unevenly. The umbel is surrounded by three to six linear-lanceolate bracts . The shell of the multi-flowered döldchen is composed of five to ten elliptically pointed shell leaves. These vary in shape and size, but they are usually longer than the dozen. They can be free or slightly overgrown at the bottom. The hermaphroditic and five-fold single flower has no calyx . The five petals are colored yellow. The flowering period extends from July to August.
The fruit, a winged double achane 5 to 6 millimeters long , is hairless and has a glossy brown-black color. It has yellowish-brown main ribs, with a narrow oil channel in each rib.
Chromosome number
The number of chromosomes is 2n = 14.
Flower biology
The rock rabbit's ear is pollinated by insects. It has several mechanisms to attract potential pollinators: The accumulation of small flowers in the terminal umbel umbrellas sends out a signal to possible pollinators. This is supported by the yellow color of the petals and also by the sweet secretion secreted by the stylus pad.
Occurrence
The rock rabbit's ear is native to the southern and eastern Alps . Its distribution area runs from the French Maritime Alps over the Carnic Alps to the Steiner Alps. Its distribution area includes the countries France, Italy, Austria, Slovenia and Croatia. The rock hare's ear is most widespread in the southern and western Alps. There it colonizes cushions of sedge lawns , rock crevices and stony places at altitudes between 1300 and 2200 (3000) meters on the calcareous subsoil .
swell
- Xaver Finkenzeller, Jürke Grau: Alpenblumen , Mosaik-Verlag 1985. ISBN 3-570-01349-9
- Bupleurum petraeum L. = B. graminifolium Vahl. in: Les belles fleurs de la France (fr.)
Individual evidence
- ↑ a b c d e f g h i Xaver Finkenzeller, Jürke Grau: Alpenblumen , p. 156.
- ↑ a b Bupleurum petraeum L. = B. graminifolium Vahl. in: Les belles fleurs de la France (fr.)
- ↑ a b c d Wolfgang Adler, Karl Oswald, Raimund Fischer: Exkursionsflora von Österreich , Ulmer Verlag p. 554ff.
- ↑ Bupleurum petraeum at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Report on the excursion Julian Alps (PDF; 1.9 MB).
- ^ R. Hand (2011): Apiaceae. - In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity. Data sheet Bupleurum
