Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Alisma gramineum Lej.
- Family: Water-plantain (Alismataceae)
- Flowering: June-September
- Field Marks: Species of Alisma have 3 small white or pinkish petals, 3 sepals, and a ring of as many as 25 pistils and achenes in a single whorl. This species differs from others in the genus by its linear to elliptic leaves never more th
- Habitat: Marshes, mud flats, sometimes submerged in water.
- Habit: Perennial herb with fleshy rhizomes.
- Stems: Only the flower-bearing stem above ground, upright, up to 1 1/2 feet tall, smooth.
- Leaves: All basal, linear to elliptic to lanceolate, up to 8 inches long, up to 1 1/2 inches wide, pointed at the tip, smooth; leaf stalks slender, smooth.
- Flowers: Several in whorls forming a panicle, the panicle up to 1 1/2 feet long; flower stalks slender, up to 1 1/2 inches long, subtended by papery bracts.
- Sepals: 3, free from each other, green, up to 1/8 inch long.
- Petals: 3, free from each other, pinkish, up to 1/6 inch long.
- Stamens: 6-9, about as long as the pistils.
- Pistils: Up to 20 arranged in a single whorl, each with a superior ovary.
- Fruits: Achenes up to 20 in a single whorl, each achene up to 1/8 inch long, with a short, curved beak at the tip.
- Notes: The leaf shape is variable in this species. The plants may be submerged in water or rooted in mud. The achenes are eaten by waterfowl.
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