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N Xyrc D9741.JPG
Xyris complanata flower close-up
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Xyridaceae
Genus: Xyris
  • Kotsjiletti Adans.
  • Xuris Adans.
  • Xyroides Thouars
  • Ramotha Raf.
  • Synoliga Raf.
  • Schismaxon Steud.

Xyris, the yelloweyed grasses, is a genus of flowering plants in the Yellow-eyed-grass family. The genus counts over two hundred fifty species, widespread over much of the world, with the center of distribution in the Guianas.[2][3][4]

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.[3]

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] [3]


  1. ^ a b "Xyris". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 2008-10-12. 
  2. ^ a b Kew World Checklist of Selected Plant Families
  3. ^ a b c "Xyris". Flora of North America. Retrieved 2008-10-12. 
  4. ^ Flora of China, Vol. 24 Page 4, 黄眼草属 huang yan cao shu, Xyris Linnaeus, Sp. Pl. 1: 42. 1753; Gen. Pl. ed. 5; 25, 1754.

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