Xyris

{{Short description|Genus of yelloweyed grasses}} {{Redirect-synonym|Yellow-eyed grass|Sisyrinchium californicum}} {{Automatic taxobox |image = N Xyrc D9741.JPG |image_caption = ''Xyris complanata'' |taxon = Xyris |authority = L.<ref name="APC">{{cite web |title=''Xyris'' |url=https://biodiversity.org.au/nsl/services/apc-format/display/101548 |publisher=Australian Plant Census |access-date=20 July 2025}}</ref> |synonyms_ref = <ref name="APC" /> |synonyms = ''Xuris'' Raf. orth. var. }}

'''''Xyris''''' is a genus of flowering plants, the '''yelloweyed grasses''', in the yellow-eyed-grass family. The genus counts over 250 species, widespread over much of the world, with the center of distribution in the Guianas.<ref name="PoWO">{{cite web |title=''Xyris'' |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:327087-2 |publisher=Plants of the World Online |access-date=20 July 2025}}</ref><ref name=FONA/><ref>[http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=135197 Flora of China, Vol. 24 Page 4, <big>黄眼草属</big> huang yan cao shu, ''Xyris'' Linnaeus, Sp. Pl. 1: 42. 1753; Gen. Pl. ed. 5; 25, 1754. ]</ref>

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 borne on a spherical or cylindrical spike or head (inflorescence). Each flower grows from the axil of a leathery bract. The fruit is a nonfleshy, 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.<ref name=FONA/>

The APG IV system, of 2016, places the genus in family Xyridaceae, into the order Poales in the clade commelinids, in the monocots.

Species include:<ref name=APNI>{{cite web|url=http://www.anbg.gov.au/cgi-bin/apni?TAXON_NAME=XYRIS|title=''Xyris''|access-date=2008-10-12|work=Australian Plant Name Index (APNI), IBIS database|publisher=Centre for Plant Biodiversity Research, Australian Government, Canberra}}{{Dead link|date=July 2025 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> <ref name=FONA>{{cite web|title=''Xyris''|work=Flora of North America|url=http://www.efloras.org/browse.aspx?flora_id=1&start_taxon_id=135197|access-date=2008-10-12}}</ref> {{Columns-list|colwidth=22em| * ''Xyris ambigua'' Beyrich ex Kunth * ''Xyris andina'' Malme * ''Xyris arenicola'' * ''Xyris asperula'' * ''Xyris baldwiniana'' Schultes * ''Xyris bayardii'' * ''Xyris brevifolia'' Michaux * ''Xyris bulbosa'' * ''Xyris caroliniana'' Walter * ''Xyris chapmanii'' * ''Xyris communis'' * ''Xyris complanata'' R.Br. * ''Xyris decipiens'' N.E.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 flexuosa'' * ''Xyris floridana'' * ''Xyris gracilis'' R.Br. * ''Xyris gracillima'' F.Muell. * ''Xyris inaequalis'' N.A.Wakef. * ''Xyris indica'' L. * ''Xyris indivisa'' N.A.Wakef. * ''Xyris iridifolia'' * ''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 louisianica'' * ''Xyris macrocephala'' * ''Xyris marginata'' Rendle * ''Xyris montana'' Ries * ''Xyris muelleri'' Malme * ''Xyris neglecta'' * ''Xyris operculata'' Labill. * ''Xyris pallescens'' * ''Xyris panacea'' * ''Xyris papillosa'' * ''Xyris paradisiaca'' * ''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 subalata'' * ''Xyris tennesseensis'' Kral * ''Xyris torta'' Smith * ''Xyris ustulata'' L.A.Nilsson }} thumb|right|Stand of mostly ''Xyris complanata'' in a small wetland

==References== {{Reflist}}

==External links== * [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=135197 ''Xyris'' in the ''Flora of North America'']

Category:Xyris Category:Poales genera