Distichia

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Distichia
Distichia muscoides

Distichia muscoides

Systematics
Class : Bedecktsamer (Magnoliopsida)
Monocots
Commelinids
Order : Sweet grass (Poales)
Family : Rush Family (Juncaceae)
Genre : Distichia
Scientific name
Distichia
Nees & Meyen

Distichia is a genus of plants fromthe rush family (Juncaceae). The genus includes only three species, all of which are common in the Andes.

description

Distichia species are evergreen , perennial, herbaceous , hairless cushion plants whose stem axis is more or less regularly branched. The leaves are in a dense, strictly two-line arrangement, the broad leaf sheath is longer than the cylindrical blade and also encloses the leaf above.

Distichia species are dioeciously separated sexes ( diocesan ). The inflorescences are reduced to single flowers , which arise laterally at approximately the extreme end of the inflorescence axis . They have two to four very small, membranous bracts . The bracts are lanceolate. The male flowers are long-stalked and have six stamens , the anthers are linear and around ten times as long as the stamens . The female flowers are short-stalked and the three thread-like stigmas are papilose and sticky. The ovary sits on a short gynophore , which stretches with maturity. The monocular capsule fruits contain numerous seeds.

distribution

The genus is restricted to the high elevations of the Andes. While Distichia muscoides is comparatively widespread from Colombia to Argentina, the other two species are of limited distribution.

Systematics and botanical history

The genus was first described in 1843 by Christian Gottfried Daniel Nees von Esenbeck and Franz Meyen , the type species is Distichia muscoides . The generic name refers to the two-line arrangement of the leaves (Greek distichia = "double row").

The genus includes three types:

  • Distichia acicularis Balslev & Laegaard : It occurs in western and central Ecuador.
  • Distichia filamentosa Buchenau : It occurs in Bolivia, Peru and northern Chile.
  • Distichia muscoides Nees & Meyen : It occurs in Colombia, Bolivia, Ecuador, Peru and northwestern Argentina.

proof

  1. ↑ a b c d e Henrik Balslev & Alejandro Zuluaga: Flora de Colombia - Juncaceae. 2009, p. 10, Bogotá, ISSN  0120-4351
  2. ↑ Helmut Genaust: Etymological dictionary of botanical plant names. 3rd, completely revised and expanded edition. Birkhäuser, Basel / Boston / Berlin 1996, ISBN 3-7643-2390-6 (reprint ISBN 3-937872-16-7 ).
  3. ↑ a b c Rafaël Govaerts (Ed.): Distichia. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved October 8, 2016.