Nodding saxifrage
| Nodding saxifrage | ||||||||||||
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Nodding Saxifrage ( Saxifraga cernua ) in Greenland |
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| Saxifraga cernua | ||||||||||||
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The nodding saxifrage ( Saxifraga cernua ) is a species in the genus saxifrage ( Saxifraga ) in the family Saxifragaceae (Saxifragaceae).
features
The nodding saxifrage is a perennial herbaceous plant that reaches heights of 10 to 15 centimeters. The stem is simple, upright, hairy and leafy, at the top it is usually nodding. The leaves, which are arranged in basal rosettes and alternately on the stem, are divided into petioles and leaf blades. The leaf blade is 10 to 20 millimeters wide, its outline is heart- to kidney-shaped and they are divided up to the middle into 3 to 7 wide lobes, and they are loosely hairy. The uppermost stem leaves are unlobed, oblong-egg-shaped and sessile. There are in the leaf axils breeding nodules ( bulbils ) for vegetative propagation are formed.
The stem has only one flower. The five sepals are mostly purple in color. The five white petals are 8 to 12 millimeters long, up to four times as long as the blunt calyx lobes, glabrous, obovate and wedge -shaped towards the base.
The flowering time is in July and August depending on the location.
The species has chromosome number 2n = 60 or 64; in the non-European Arctic, however, the numbers 24, 48, 52, 56, approx. 68, 70 or 72 occur.
Occurrence
The nodding saxifrage is widespread in the arctic and subarctic regions of Eurasia and North America and is also found in the high mountains of the temperate latitudes of the northern hemisphere. The species is very rare in the Alps. The deposits can be found in the subalpine to alpine altitudes, at altitudes of 1800 to 2800 meters, on moist, shady rock ledges, caves and storage areas over lime and gneiss.
literature
- Xaver Finkenzeller, Jürke Grau : Alpine flowers (= Steinbach's natural guide. ). New, edited special edition. Mosaik-Verlag GmbH, Munich 1996, ISBN 3-576-10558-1 .
- Data sheet PDF with text by CL Hitchcock, A. Cronquist, M. Ownbey & JW Thompson: Vascular Plants of the Pacific Northwest , Part 3: Saxifragaceae to Ericaceae , 1961, University of Washington Press, Seattle, WA., 614 ff.
- Klaus Kaplan in Gustav Hegi : Illustrated flora of Central Europe . 3rd edition Volume IV, 2 A, pages 192-193. Blackwell-Wissenschaftsverlag Berlin 1995. ISBN 3-8263-3016-1
Web links
- Saxifraga cernua L. In: Info Flora , the national data and information center for Swiss flora . Retrieved November 2, 2015.