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Brasenia
''Brasenia'' is a genus belonging to the family Cabombaceae, consisting of one extant species, ''Brasenia schreberi''. It is widely distributed in North America, the West Indies, northern South America (Venezuela, Guyana), eastern Asia (China, Japan, Korea, Primorye), Australia, the Indian Subcontinent, and parts of Africa.〔(Kew World Checklist of Selected Plant Families )〕〔(Biota of North America Program, 2013 county distribution map )〕〔(Flora of China Vol. 6 Page 119, 莼菜属 chun cai shu, ''Brasenia'' Schreber, Gen. Pl. 1: 372. 1789. )〕〔Iwatsuki, K., Boufford, D.E. & Ohba, H. (eds.) (2006). Flora of Japan IIa: 1-550. Kodansha Ltd., Tokyo.〕〔Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.〕〔Figueiredo, E. & Smith, G.F. (2008). Plants of Angola. Strelitzia 22: 1-279. National Botanical Institute, Pretoria.〕〔Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies. Smithsonian Contributions to Botany 98: 1-1192.〕
''Brasenia'' is a perennial aquatic plant with floating, peltate leaves and rhizomatous stems. It is identified by its bright green leaves, small purple flowers that bloom from June through September, and a thick mucilage that covers all of the underwater organs, including the underside of the leaves, stems, and developing buds. This mucilage may be an anti-herbivore defence trait,〔Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. Figure 6.9〕 perhaps to deter snail grazing. It grows in shallow water of lakes, rivers and beaver ponds, particularly those with somewhat acidic water.
== Characteristics ==
''Brasenia'' exhibits wind pollination. The flowers have a two-day blooming period. On the first day, the functionally female, or pistillate flower, extends above the surface of the water and exposes the receptive stigmas. The flower then recedes below the water surface and on the following day emerges as a functionally male, or staminate flower. It is elevated higher than on the previous day and the anther-bearing filaments are extended beyond the female carpels.〔Taylor,Mackenzie L. and Jeffrey M. Osborn. 2006. Pollen ontogeny in ''Brasenia'' (Cabombaceae, Nymphaeales). American Journal of Botany 93: 344-356〕 The anthers dehisce, releasing the pollen, and the flower is then withdrawn below the water where the fruit develops.
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