Rhynchospora

White beak-sedge ( Rhynchospora alba ) on the right, Brown beak-sedge ( Rhynchospora fusca ) left.

Schnabel Riede ( Rhynchospora ) are a genus within the family of Sedge family ( Cyperaceae ). In Germany come to FloraWeb before the two styles White beak-sedge ( Rhynchospora alba) and brown beak-sedge ( Rhynchospora fusca ).

Description

Rhynchospora species usually grow as a perennial, rarely as annuals, herbaceous plants. The several standing together, upright stems are triangular or terete. The undergraduate or distributed on the culm arranged leaves consist of a closed leaf sheath and a simple leaf blade. The rulers leaf blade is flat or canalicular.

The bracts are leaf-like foliage. The Rispige total inflorescence is composed of several aged men or capitate partial inflorescences. The stalked or sitting spikelets (Part inflorescences) are narrow - ovate, ovate or elliptical and can sometimes be somewhat flattened. The few to many einnervigen glumes are spirally arranged like roof tiles overlapping or rarely distichous; three or four basal glumes are shorter than the other and empty. Either all flowers hermaphrodite or in the inflorescence are the lower and the upper hermaphrodite male or sterile. There are no up to six, rarely up to 13, reduced to rough or smooth bristles bloom yet. There are two or three stamens present. The slim style ends in two scars.

The nut fruits are usually obovate to oval, biconvex, and its surface is structured differently or rarely smooth.

System

The first description of the genus Rhynchospora in 1805 by Martin Vahl in Enumeratio Plantarum ..., 2, p 229 are with the type species Rhynchospora alba (L.) Vahl Rhynchospora Vahl .. synonyms for: Dichromena Michaux and Psilocarya A.Gray.

There are about 250 to 350 Rhynchopora species. selection:

  • White beak-sedge ( Rhynchospora alba (L.) Vahl )
  • Rhynchospora chinensis Nees & Meyen ex Nees
  • Rhynchospora corymbosa (L.) Britton
  • Rhynchospora faberi C.B.Clarke
  • Brown beak-sedge ( Rhynchospora fusca (L.) WTAiton )
  • Rhynchospora gracillima Thwaites
  • Rhynchospora malasica C.B.Clarke
  • Rhynchospora rubra ( Lour. ) Makino
  • Rhynchospora rugosa ( Vahl ) Gale
  • Rhynchospora submarginata Kükenthal

Pictures

Rhynchospora colorata

Swell

  • Prof. Song Yun Liang & David A. Simpson: Rhynchopora in the Flora of China, Volume 23, 2010, p 253: Online. (Section Description and systematics)
  • Robert Kral: Rhynchopora in the Flora of North America, Volume 23, 2002, p 200: Online. ( Description section )
William Aiton
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