Xyris

"Yellow-eyed grass" redirects here. Yellow-eyed grass may also refer to Sisyrinchium californicum.
Xyridaceae
Xyris complanata flower close-up
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Xyridaceae
Genus: Xyris
L.[1]
Synonyms[2]
  • 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. Xyris andina Malme
  2. Xyris ambigua Beyrich ex Kunth
  3. Xyris arenicola
  4. Xyris asperula
  5. Xyris baldwiniana Schultes
  6. Xyris bayardii
  7. Xyris brevifolia Michaux
  8. Xyris bulbosa
  9. Xyris caroliniana Walter
  10. Xyris chapmanii
  11. Xyris communis
  12. Xyris complanata R.Br.
  13. Xyris decipiens N.E.Br.
  14. Xyris difformis Chapman
  15. Xyris drummondii Malme
  16. Xyris elliottii Chapman
  17. Xyris elongata Rudge
  18. Xyris exilis Doust & B.J.Conn
  19. Xyris fimbriata Elliott
  20. Xyris flabelliformis Chapman
  21. Xyris flexifolia R.Br.
  22. Xyris flexuosa
  23. Xyris floridana
  24. Xyris gracilis R.Br.
  25. Xyris gracillima F.Muell.
  26. Xyris inaequalis N.A.Wakef.
  27. Xyris indica L.
  28. Xyris indivisa N.A.Wakef.
  29. Xyris iridifolia
  30. Xyris isoetifolia Kral,
  31. Xyris jupicai Richard
  32. Xyris juncea R.Br.
  33. Xyris lacera R.Br.
  34. Xyris lanata R.Br.
  35. Xyris laxiflora F.Muell.
  36. Xyris laxifolia Martius
  37. Xyris longisepala Kral
  38. Xyris louisianica
  39. Xyris macrocephala
  40. Xyris marginata Rendle
  41. Xyris montana Ries
  42. Xyris muelleri Malme
  43. Xyris neglecta
  44. Xyris operculata Labill.
  45. Xyris pallescens
  46. Xyris panacea
  47. Xyris papillosa
  48. Xyris paradisiaca''
  49. Xyris pauciflora Willd.
  50. Xyris platylepis Chapman
  51. Xyris roycei N.A.Wakef.
  52. Xyris scabrifolia R. M. Harper,
  53. Xyris serotina Chapman
  54. Xyris smalliana Nash
  55. Xyris stricta Chapman,
  56. 'Xyris subalata
  57. Xyris tennesseensis Kral
  58. Xyris torta Smith
  59. Xyris ustulata L.A.Nilsson


References

  1. 1 2 "Xyris". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 2008-10-12.
  2. 1 2 Kew World Checklist of Selected Plant Families
  3. 1 2 3 "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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