Alisma gramineum


Flore des Environs de Spa 1: 175. 1811

Common names: Grass-leaved water-plantain alisma graminoide
Synonyms: Alisma geyeri Torrey Alisma gramineum var. angustissimum A. J. Hendricks Alisma gramineum var. wahlenbergii Raymond & Kucyniak
Treatment appears in FNA Volume 22.
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


V22 109-distribution-map.jpg

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.




Lower Taxa

No lower taxa listed.