Gray sun rose

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Gray sun rose
Gray sun rose (Helianthemum canum)

Gray sun rose ( Helianthemum canum )

Systematics
Rosids
Eurosiden II
Order : Mallow-like (Malvales)
Family : Rockrose family (Cistaceae)
Genre : Sun rose ( Helianthemum )
Type : Gray sun rose
Scientific name
Helianthemum canum
( L. ) Baumg.

The Gray Sonnenröschen ( helianthemum canum ) is a plant from the genus of Sonnenröschen ( helianthemum ) within the family of rockrose (Cistaceae).

description

Habitus
Stems with leaves. These have no stipules.
The leaves are dense gray-tomentose underneath.

The gray sun rose is very changeable in terms of the size of all parts, the growth and the hair ( indument ). In Lower Franconia, there are forms whose leaves are small, thick and flat-edged, and the lower ones, therefore, represent strong approximations of the northern European species Helianthemum oelandicum .

Appearance and leaf

The gray sun rose grows as a subshrub and reaches heights of 10 to 20 centimeters. The flower-bearing branches are mostly upright or ascending and loosely or more densely tomentose. The leaves are linear to eilanzettlich shaped, up to 3 cm long, about 6 mm wide and narrowed into a short, about 1 cm long stalk. They are hairy gray or white tomentose on both sides or at least underneath, also tufted at the edge. Stipules are usually not present.

Generative characteristics

The flowering time is in May and June. The hermaphrodite flowers are radially symmetrical and five-fold. The inner sepals are broadly ovate, blunt or pointed, the outer more linear. The petals are yellow, rarely yellowish white, about 3 to 8 mm long and up to twice as long as the inner sepals. The stylus is curved in an S-shape at the base and thickened towards the tip. The fruit stalks are upright or horizontal.

The light brown capsule fruit is triangular, ovoid-spherical and contains several seeds. The red-brown seeds are round to polygonal and mostly smooth.

The number of chromosomes is 2n = 22.

Occurrence

Helianthemum canum occurs in Central, Western and Southern Europe ; advancing east to southern Russia , Asia Minor and Armenia . The largest population in Western Europe is found in the limestone area of ​​the Burren in western Ireland. It is a sub-Mediterranean floral element . In Austria it occurs scattered in the Pannonian area , otherwise it is rare, in Switzerland it is found generally scattered. The gray sun rose is rare in Germany; it occurs in Thuringia , Lower Franconia , Baden-Württemberg and in the Saale-Unstrut area in southern Saxony-Anhalt .

The gray sun rose grows on dry grassland and in dry pine forests. It thrives best on warm, lime-rich, and stony soils . In Central Europe it is a character type of the Xerobromion association , but also occurs in societies of the Erico-Pinion association.

Species protection

Endangerment in Germany: Category 3 = endangered. The gray sun rose is "specially protected" according to the Federal Species Protection Ordinance (BArtSchV).

literature

  • Henning Haeupler, Thomas Muer: picture atlas of the fern and flowering plants of Germany . Ed .: Federal Agency for Nature Conservation (=  The fern and flowering plants of Germany . Volume 2 ). Eugen Ulmer, Stuttgart (Hohenheim) 2000, ISBN 3-8001-3364-4 .
  • Wolfgang Adler, Karl Oswald, Raimund Fischer: Excursion flora of Austria . Ed .: Manfred A. Fischer. Eugen Ulmer, Stuttgart / Vienna 1994, ISBN 3-8001-3461-6 .
  • Christian Heitz: School and excursion flora for Switzerland. Taking into account the border areas. Identification book for wild growing vascular plants . Founded by August Binz. 18th completely revised and expanded edition. Schwabe & Co., Basel 1986, ISBN 3-7965-0832-4 .
  • Erich Oberdorfer : Plant-sociological excursion flora . With the collaboration of Theo Müller. 6th, revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 1990, ISBN 3-8001-3454-3 .
  • Konrad von Weihe (ed.): Illustrated flora. Germany and neighboring areas. Vascular cryptogams and flowering plants . Founded by August Garcke. 23rd edition. Paul Parey, Berlin / Hamburg 1972, ISBN 3-489-68034-0 .

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp.  669 .
  2. ↑ grass deserts. In: Black Forest Messenger . June 3, 2017. Retrieved October 5, 2017 .

Web links

Commons : Gray Sunflower ( Helianthemum canum )  - album with pictures, videos and audio files