Family: Alismataceae
Narrow-Leaf Water-Plantain , more...narrowleaf water plantain, Geyer waterplantain, grasslike waterplantain, lanceleaf water plantain
[ Alisma arcuatum var. angustissimum, more, Alisma geyeri Torr., Alisma gramineum var. angustissimum (DC.) Hendricks, Alisma gramineum var. geyeri (Torr.) Lam., Alisma gramineum var. graminifolium (Wahlenb.) Hendricks, Alisma gramineum var. wahlenbergii auct. non (Holmb.) Raymond & Kucyniak] |
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. Flowering summer--fall. Shallow fresh or brackish water or muddy shores; 30--1800 m; 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. Rhizome 0.3-1.5 cm thick; lvs usually submerged, very thin, linear, 15-100 cm נ2-13 mm, but sometimes terrestrial or emersed, the blade then rather narrowly lance-elliptic, tapering to the base, 2-6 cm נ4-15 mm, 2.7-5 times as long as wide; pedicels stout; sep 1.3-2.2 mm; pet faintly anthocyanic, 2.3-3.7 נ2.1-3.7 mm; anthers 0.3-0.6 mm; style short, 0.3-0.6 mm, uncinate-curved; achenes 11-20, 1.8-2.6 mm, with a median dorsal ridge flanked by a groove on each side; 2n=14. Circumboreal, in Amer. s. to N.Y., Wis., Mo., Nebr., Colo., and Calif. June-Aug. (A. geyeri)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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