Xyris

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Xyridaceae
Xyris complanata flower close-up
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Xyridaceae
Genus: Xyris
L.[1]
species

see text

Xyris is a genus of flowering plants in the Yellow-eyed-grass family. The genus counts over two hundred fifty species, with the center of distribution in the Guianas.

Stand of mostly Xyris complanata in a small wetland

The leaves are mostly distichous, linear, flat and thin or round with a conspicuous sheath at the base. They are arranged in a basal aggregation. The small, yellow flowers are dioecious, borne on a spherical or cylindrical spike or head (inflorescence). Each flower grows from the axil of a leathery bract. The fruit is a non-fleshy, dehiscent capsule. In Xyris complanata a single flower bud on the spike appears in the morning, and expands into a conspicuous flower during the afternoon hours.

The APG II system, of 2003, places the genus in family Xyridaceae, into the order Poales in the clade commelinids, in the monocots.

Species include:[1] [2]

  • Xyris andina Malme
  • Xyris ambigua Beyrich ex Kunth
  • Xyris baldwiniana Schultes
  • Xyris brevifolia Michaux
  • Xyris caroliniana Walter
  • Xyris complanata R.Br.
  • Xyris difformis Chapman
  • Xyris drummondii Malme
  • Xyris elliottii Chapman
  • Xyris elongata Rudge
  • Xyris exilis Doust & B.J.Conn
  • Xyris fimbriata Elliott
  • Xyris flabelliformis Chapman
  • Xyris flexifolia R.Br.
  • Xyris gracilis R.Br.
  • Xyris gracillima F.Muell.
  • Xyris inaequalis N.A.Wakef.
  • Xyris indica L.
  • Xyris indivisa N.A.Wakef.
  • Xyris isoetifolia Kral,
  • Xyris jupicai Richard
  • Xyris juncea R.Br.
  • Xyris lacera R.Br.
  • Xyris lanata R.Br.
  • Xyris laxiflora F.Muell.
  • Xyris laxifolia Martius
  • Xyris longisepala Kral
  • Xyris marginata Rendle
  • Xyris montana Ries
  • Xyris muelleri Malme
  • Xyris operculata Labill.
  • Xyris pauciflora Willd.
  • Xyris platylepis Chapman
  • Xyris roycei N.A.Wakef.
  • Xyris scabrifolia R. M. Harper,
  • Xyris serotina Chapman
  • Xyris smalliana Nash
  • Xyris stricta Chapman,
  • Xyris tennesseensis Kral
  • Xyris torta Smith
  • Xyris ustulata L.A.Nilsson


References

  1. ↑ 1.0 1.1 "Xyris". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 2008-10-12. 
  2. ↑ "Xyris". Flora of North America. Retrieved 2008-10-12. 

External links

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