Sempervivum arachnoideum
Cobweb Houseleek (Sempervivum arachnoideum )
The Cobweb Houseleek (Sempervivum arachnoideum L., Syn: Sedum arachnoideum (L.) EHL Krause, Sempervivum sanguineum Jeanbernat ex Timbal -Lagrave ), also called Cobweb Houseleek, is a kleinrosettige Hauswurzart.
Description
The plants are large mounds, with at least during the growing season more or less strong spinnwebiger hair that connects the leaf tips with each other. Each rosettes usually have a diameter of 0.5 to 2 cm. The flowers are pale pink to deep pink, with center line in the petals. The flowering stems tower above the rosettes and reach a height of up to 18 cm. The plants are, like all species of succulent and can therefore longer drought survive well.
The chromosome number is or.
Occurrence
The Cobweb Houseleek has its natural distribution in the European mountains of the Pyrenees to the south and eastern Alps to the Apennines and Corsica. It often grows on rocks, rock debris, meadows and pastures. It prefers acidic soil environment on siliceous substrate and grows from 280 m ( in southern Switzerland ) to 2900 m in the Aosta Valley. The seeds can on a thin lichen foothold as well as in fine pores or cracks of the rock. The plant grows very slowly and is therefore reliant on no other flowering plants compete.
System
There are two subspecies:
- The Ordinary Cobweb Houseleek (Sempervivum arachnoideum subsp. Arachnoideum ) comes from the Pyrenees to far into the Eastern Alps before. The rosettes are wide to 12 mm.
- The Woolly Cobweb Houseleek (Sempervivum arachnoideum subsp. Tomentosum (CB clay. & Cut Spahn ) Schinz & Thell. ) Is in the Eastern Pyrenees, Southern Alps east spread to South Tyrol and in the Apennines and is also found in Corsica. In Switzerland, it occurs in Graubünden, Ticino and Valais. This subspecies has a strong, weißfilzige pubescence of the rosettes. The up to 35 mm wide rosettes are strongly flattened above.
Use
The species is often cultivated in rock gardens.
Swell
- Gustav Hegi: Illustrated Flora of Central Europe. Volume IV, Part 2 A. 2nd edition. Carl Hanser Verlag, Munich, 1961-1966.
- Henk 't Hart, Bert Bleij, Ben Zonneveld: Sempervivum. In: Urs Eggli (ed.) Encyclopedia of succulents. Crassulaceae (Stonecrop Family). Eugen Ulmer, Stuttgart 2003, ISBN 3-8001-3998-7, pp. 349 f
- Manuel Werner: Houseleek species in the Alps. Sempervivum and Jovibarba. In: Avonia. Volume 28, Number 4, 2010, pp. 131-138.