
Villarsia is a genus of aquatic flowering plants in the family Menyanthaceae. The genus is named for the French botanist Dominique Villars (1745–1814). Villarsia are wetland plants with basal leaves. The inflorescence is a branched panicle with numerous flowers. Flowers are five-parted, either yellow or white, and the petals are adorned with win...
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http://en.wikipedia.org/wiki/Villarsia

Villarsia are a genus of Australian and South African herbaceous marsh plants, belonging to the family Gentianaceae. They bear white or yellow flowers arranged in cymes.
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http://www.probertencyclopaedia.com/browse/BV.HTM
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