Potamogeton alpinus Balb.
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Authority
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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Family
Potamogetonaceae
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Scientific Name
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Description
Species Description - Stem slender, somewhat flattened, often branched, to 2 m; rhizomes elongate; lvs sessile, linear, to 2 dm, 2–10 mm wide, 5–13-nerved, the midrib flanked by a pair of conspicuous bands (each 1–2+ mm wide) of pale green or translucent lacunar cells; stipules 1–3 cm, free; floating lvs usually numerous, linear-elliptic to somewhat spatulate or narrowly obovate, 3–7 cm × 8–20 mm, 11–27-veined, mostly obtuse, narrowed below to a slender petiole about as long as the blade; peduncles about as thick as the stem, 2–5 cm, seldom longer; spikes numerous, cylindric, dense, 1–3 cm; frs obliquely obovoid, 2.5–4 mm, shallowly pitted, the sharp dorsal keel flanked by a pair of lower ones; 2n=26. Ponds and slow streams; Nf. to Que. to s. Alas., s. to Ga., La., and Calif.
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Common Names
red pondweed