Xyris
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 Xyris complanata flower close-up
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Xyris is the botanical name of a genus of flowering plants. The genus counts over two hundred fifty species, with the center of distribution in the Guiana's.
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, in to the order Poales in the clade commelinids, in the monocots.
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