One-headed knapweed

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One-headed knapweed
Centaurea uniflora.jpg

Single-headed knapweed ( Centaurea uniflora )

Systematics
Order : Astern-like (Asterales)
Family : Daisy family (Asteraceae)
Subfamily : Carduoideae
Tribe : Cynareae
Genre : Knapweed ( Centaurea )
Type : One-headed knapweed
Scientific name
Centaurea uniflora
Turra

The Centaurea uniflora ( Centaurea uniflora ) is a plant from the genus of knapweed ( Centaurea ) in the family of Compositae (Asteraceae).

features

The single-headed knapweed is a perennial herbaceous plant that reaches heights of 5 to 40 cm. It is densely haired with white felt and covered with short, multicellular, coarse hair. The stem is upright, leafy and has only one flower head. The green-gray leaves are dotted with glands, narrow-lanceolate and narrower than one centimeter. They are whole or slightly serrated, the upper ones sit on the stem.

The green envelope is about as long as it is wide and is mostly covered by the appendages of the middle envelope scales, which are elongated into a long, light brown, feathery, bent-back tip. The appendages of the inner scales are entire. As is usual with the subfamily Carduoideae , only tubular flowers are present; they are purple. The tubular florets at the edge are slightly zygomorphic and enlarged. The flowering period extends from July to September. The achenes are gray-brown.

Occurrence

The single-headed knapweed is widespread in the western Alps from the Maritime Alps to the Isèretal and the Graian Alps . It occurs at altitudes over 1500 m on warm, dry and nutrient-rich soils on meadows and slopes.

Systematics

Feathery knapweed ( Centaurea nervosa )

Centaurea uniflora belongs to a group of closely related species, also known as Centaurea uniflora aggr. are designated. The following are also counted here:

  • Centaurea alibeyana Font cross & Pau (Syn .: Centaurea uniflora subsp. Alibeyana (Font cross & Pau) Arenes ): It occurs in Morocco.
  • Centaurea bugellensis (Soldano) Soldano (Syn .: Centaurea uniflora subsp. Bugellensis Soldano ): It occurs in Italy.
  • Centaurea flosculosa Willd. : It occurs in Switzerland and France and also used to occur in Italy.
  • Feathery knapweed ( Centaurea nervosa Willd. , Syn .: Centaurea uniflora subsp. Nervosa (Willd.) Bonnier & Layens ): It occurs in France, Switzerland, Italy, Austria, Slovenia, Serbia, Montenegro, Albania, Macedonia, Greece , Bulgaria and Romania.
  • Centaurea rhaetica Moritzi : It occurs in Switzerland and Italy.
  • Centaurea uniflora Turra : It occurs in France and Italy.

literature

  • Gunter Steinbach (Ed.): Alpine flowers (Steinbach's natural guide). Mosaik Verlag GmbH, Munich 1996, ISBN 3-576-10558-1 .

Individual evidence

  1. ↑ a b c d e f g Werner Greuter (2006+): Compositae (pro parte majore). - In: W. Greuter & E. von Raab-Straube (eds.): Compositae. Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity. Datasheet Centaurea uniflora aggr. In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity.

Web links

Commons : Single-headed Knapweed  - Collection of images, videos, and audio files