Geum

Water Avens ( Geum rival )

The cloves Wurzen ( Geum ) are a genus of the rose family ( Rosaceae ).

Features

Cloves Wurzen are perennial herbaceous plants. They have a basic leaf rosette of unpaired fiederschnittigen leaves whose terminal lobes are enlarged as well as the top two lobes. The upright inflorescence axis grows from the axils of rosette leaves and leafy, the leaves are stängelbürtigen less incised than those of the rosette.

The inflorescence is terminal, sympodial and mostly wenigblütig. The flower cup is bowl- to cup-shaped or reversed cone, an outer calyx is present ( exception: Geum vernum ), its lobes are smaller than the actual sepals, they lie flush against each other or overlap each other slightly. The petals are often yellow, even pink, white, red or purple before coming.

Occasionally, a ( never excellent ) discussion between the numerous stamens (20 to many). Also the stylus are numerous and grow from the base of the flower cup or a cone-shaped or cylindrical ring, the lower part is formed in some species to a Gynophor. At its end, they divide into branches stylus, the bottom of which is extended after flowering, binding and hook-shaped, the upper part, however, falls off. The scars are point-like.

When fruits are formed achenes. The seeds have a membranous shell.

The majority of species hexaploid, the number of chromosomes is 2n = 42, and also 28, 56, 70 and 84 occur.

Dissemination

The cloves Wurzen are widely used in Europe, Asia, North and South America, and with a kind in South Africa. They are found in open vegetation and forests, sometimes referred to as weeds.

Types (selection)

There are around 30 species of Avens:

Central European species:

  • Mountain Avens ( Geum montanum L.)
  • Avens ( Geum urbanum L.)
  • Creep Avens ( Geum reptans L.)
  • Water Avens ( Geum rival L.)

Other types:

  • Geum aleppicum Jacq.
  • Geum bulgaricum Pančić
  • Geum calthifolium Menzies ex Sm
  • Geum canadense Jacq.
  • Geum chiloense Balb. ex Ser.
  • Geum capense Thunb.
  • Red Avens ( Geum coccineum Sibth. & Sm )
  • Geum elatum Wall. ex G. Don
  • Geum heterocarpum Boiss.
  • Geum japonicum Thunb.
  • Geum leiospermum Petrie
  • Geum macrophyllum Willd.
  • Geum molle Vis. & Pančić
  • Geum parviflorum Comm. ex Sm
  • Geum peckii Pursh
  • Geum pentapetalum (L.) Makino
  • Geum pyrenaicum Mill
  • Geum rhodopeum Stoj. & Stef.
  • Geum rossii ( R. Br ) Ser.
  • Geum sikkimense Prain
  • Geum sylvaticum Pourret
  • Geum triflorum Pursh
  • Geum turbinatum Rydb.
  • Geum uniflorum book
  • Virginia Avens ( Geum virginianum L.)

Evidence

  • C. Kalkman: Rosaceae. In: Klaus Kubitzki (ed.): The Families and Genera of Vascular Plants - Volume VI - Flowering Plants - Dicotyledons - Celastrales, Oxalidales, Rosales, Cornales, Ericales, 2004, p 367
Geum rivale Rosids Stigma (botany)
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