Biology:Xyris
| Xyris | |
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| Xyris complanata flower close-up | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Clade: | Commelinids |
| Order: | Poales |
| Family: | Xyridaceae |
| Genus: | Xyris L.[1] |
| Synonyms[2] | |
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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.[2][3][4]
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.[3]
The APG IV system, of 2016, places the genus in family Xyridaceae, into the order Poales in the clade commelinids, in the monocots.
References
- ↑ 1.0 1.1 "Xyris". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. http://www.anbg.gov.au/cgi-bin/apni?TAXON_NAME=XYRIS.
- ↑ 2.0 2.1 Kew World Checklist of Selected Plant Families
- ↑ 3.0 3.1 3.2 "Xyris". Flora of North America. http://www.efloras.org/browse.aspx?flora_id=1&start_taxon_id=135197.
- ↑ 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.
External links
Wikidata ☰ Q977464 entry
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