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Published In: Tableau du Regne Vegetal 2: 157. 1799. (5 May 1799) (Tabl. Regn. Veg.) Name publication detail

Project Name Data (Last Modified On 8/26/2009)
Acceptance : Accepted

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ALISMATACEAE (Water Plantain Family)

Plants annual or perennial. Leaves basal, with a well-developed petiole expanded into an open sheathing base, the blade sometimes reduced or absent, glabrous (pubescent elsewhere). Inflorescences panicles, racemes, or umbels. Flowers opposite or whorled, subtended by bracts, actinomorphic, perfect or unisexual. Sepals 3, green. Petals 3, white, sometimes pink or with reddish bases, dropping soon after flowers open. Stamens 6 to many. Pistils separate, 3 to many, in a ring or in a dense, headlike cluster on an expanded receptacle. Style 1 per pistil, terminal or lateral, the stigma decurrent. Ovaries superior, with 1 ovule. Fruits achenes. Eleven genera, 95 species, nearly worldwide, mostly emergent aquatics. Members of this family are important food plants for waterfowl and other wetland animals.


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1 Pistils in a single ring, the receptacle flat 1 Alisma
+ Pistils in several series, forming a dense, headlike cluster on the expanded receptacle (2)
2 (1) Flowers bisexual; fruits plump, with ribs or ridges (sometimes 1 or 2 of these winglike); whorls of flowers with several bracteoles in addition to the 3 larger bracts subtending the flowers 2 Echinodorus
+ Flowers unisexual, or if bisexual then the achenes flattened and winged; fruits flattened, usually winged along the edge and ridged on the sides; whorls of flowers with 3 bracts, lacking smaller bracteoles 3 Sagittaria
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