Difference between revisions of "Alisma gramineum"
Flore des Environs de Spa 1: 175. 1811.
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|genus=Alisma | |genus=Alisma | ||
|species=Alisma gramineum | |species=Alisma gramineum | ||
Revision as of 19:01, 24 September 2019
Herbs, 0.5–30(–50) cm. Leaves submersed, floating, or emersed; submersed sessile, ribbonlike; floating linear, 15–100 × 0.2–2(–3) cm, blade present or absent; emersed petiolate, rarely sessile, blade linear-lanceolate, lanceolate, or narrowly elliptic, 4–2–6 × 1.5 cm. Inflorescences to 50 cm. Flowers cleistogamous in submersed plants, chasmogamous in terrestrial; sepals 1.5–3 mm; petals faint purplish white, 2–4 mm, margin entire to slightly erose, apex obtuse; anthers ovoid, 0.3–0.6 mm; style ± coiled, 0.4–0.5 mm, ½ length ovary. Fruiting heads 3–6 mm diam.; achenes orbicular to orbicular-ovoid, 2–2.7 mm, with 2 shallow, abaxial grooves lateral to 1 abaxial ridge, beak erect. 2n =14.
Phenology: Flowering summer–fall.
Habitat: Shallow fresh or brackish water or muddy shores
Elevation: 30–1800 m
Distribution
Alta., B.C., Man., Ont., Que., Sask., Ariz., Calif., Colo., Idaho, Minn., Mont., Nebr., Nev., N.Y., N.Dak., Oreg., S.Dak., Utah, Vt., Wash., Wyo., Eurasia, n Africa.
Discussion
Selected References
None.