Wall rockflowers
Wall rockflowers | ||||||||||||
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Wall rock florets ( Draba muralis ), illustration |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Draba muralis | ||||||||||||
L. |
The wall rock flower ( Draba muralis ) is a representative of the rock flower ( Draba ).
features
The wall rock flower is a one to two year old plant . It reaches stature heights of 10 to 30, rarely 40 cm. In addition to the basal leaves, the stems have more than three stem leaves. These are half-stem-encompassing, roughly serrated at the tip and, like the stems, covered with 3-5-rayed star hair. The rosette leaves are 1–4 cm long, obovate and narrowed into a short stem. The leaves are mostly covered with simple hairs on the top and branched hairs on the underside. The flower cluster usually has more than 20 flowers and is quite loose later.
The sepals are broadly elliptical and 1–1.5 mm long. The petals are white and 1.5 to 2.5 mm long, rounded at the tip. Flowering time is April to July, pollination takes place by insects or self-pollination .
The pod fruit is oblong-elliptical, 4 to 6 mm long and glabrous. The stylus is mm long for fruit ripening to 0.2. The pods sit on 5–10 mm long, almost horizontal and bare stalks.
The species has chromosome number 2n = 32.
Occurrence
The wall rock flower has its main distribution area in the Mediterranean area. It is rare in Central Europe. The occurrences in Central Europe are partly indigenous and partly neophytic .
It grows in poor grass, in cracks in the earth, on embankments and walls, in bushes. It occurs preferentially on moderately dry to fresh, moderately nutrient-rich, mostly calcareous soils. It is limited to the colline altitude level . Locally it is a character type of the Anarrhinetum from the association of the Galeopsion segetum, but also occurs in societies of the association Alysso-Sedion.
literature
- Siegmund Seybold (Ed.): Schmeil-Fitschen interactive. (CD-ROM). Quelle & Meyer, Wiebelsheim 2001/2002, ISBN 3-494-01327-6 .
- Manfred A. Fischer , Karl Oswald, Wolfgang Adler: Excursion flora for Austria, Liechtenstein and South Tyrol. 3rd, improved edition. State of Upper Austria, Biology Center of the Upper Austrian State Museums, Linz 2008, ISBN 978-3-85474-187-9 .
Individual evidence
- ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5 . Page 457.
Web links
- Wall rockflowers. In: FloraWeb.de.
- Distribution map for Germany. In: Floraweb .
- Draba muralis L. In: Info Flora , the national data and information center for Swiss flora . Retrieved October 27, 2015.
- Distribution in the northern hemisphere according to: Eric Hultén , Magnus Fries: Atlas of North European vascular plants 1986, ISBN 3-87429-263-0
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )