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Genus Alisma Family Alismataceae

Description: Perennials with erect basal stems from a shortened stem or corm.

Leaves emergent on long petioles.

Inflorescence on a leafless peduncle, paniculate, with whorls of 3 or more branches subtended by bracts. Flowers bisexual. Sepals 3, green. Petals 3, white to dark pink. Stamens 6. Carpels numerous, free, laterally flattened; style lateral.

Fruit a nutlet. Aggregate fruit a head of 1-seeded nutlets.


Distribution and occurrence: World: 9 species, cosmopolitan but mainly Northern Hemisphere. Australia: 2 species (1 species endemic, 1 species naturalized), N.S.W, Vic., S.A.

Text by S. W. L. Jacobs
Taxon concept:

 Key to the species 
1Leaves with lamina lanceolate, narrowing gradually into the petiole; petals acute; style curved in lower partAlisma lanceolatum
Leaves with lamina rounded to cordate at the base; petals obtuse; style more or less straightAlisma plantago-aquatica

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