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Published In: Species Plantarum 1: 342. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

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

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1. Alisma L. (water plantain)

(Björkvist, 1967, 1968)

Plants perennial. Rhizomes 0.5B2.0 cm in diameter. Leaf blades linear to broadly elliptic or ovate, reduced or absent in submerged plants. Venation with 1B3 pairs of main veins arcing from near the base of the midrib and rejoining near the apex, these connected by finer, angled veins running parallel to one another. Inflorescences erect panicles with whorled branches. Flowers perfect, subtended by bracts. Sepals ovate, persistent. Stamens 6, the filaments as long as or longer than the anthers. Pistils 10B28, in a single ring on the flat receptacle. Styles lateral. Fruits flattened but not winged, with 1 or 2 parallel grooves along the back. Nine species, Northern Hemisphere.

In addition to their value as wildlife food plants, the starchy rootstocks have been cooked in the fall for human consumption.


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1 Emergent leaves with blades linear to elliptic, 3B5 times as long as wide, tapering at the base; backs of achenes with 2 parallel grooves on each side of a dorsal ridge 1 Alisma gramineum
+ Emergent leaves with blades ovate-lanceolate to broadly elliptic, 1.5B2.5(B3.0) times as long as wide, rounded to cordate at the base; backs of achenes with 1(2) dorsal groove (2)
2 (1) Petals 1.8B2.5 mm long, about as long as sepals; diameter of ring of mature fruits less than 3.5 mm 2 Alisma subcordatum
+ Petals 1.7B3.0 mm long, longer than sepals; diameter of ring of mature fruits 3.5B4.5 mm 3 Alisma triviale
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