Potamogeton friesii Rupr.
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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 to 1 m or more, sparingly branched below, often more freely so above, slightly compressed, to 1 mm wide, commonly with paired glands at the nodes; rhizome scarcely developed; lvs all submersed, linear, 3–7 cm × 1.5–3 mm, minutely cuspidate at the obtuse or rounded tip, (3)5–7(9)-veined, the lateral veins very delicate, the midvein flanked by a row of lacunar cells on each side extending two-thirds its length, or these wanting; stipular sheaths axillary, free, white, 0.5–2 cm, closed at base when young, becoming fibrous in age; winter-buds commonly produced, 1.5– 5 cm, the inner lvs reduced and arranged into a fan-shaped structure, set at right angles to the outer lvs; peduncles 1.5–5 cm, flattened and clavate; spike slender, 8–18 mm, with 2–5 remote whorls of fls; frs ovoid to obovoid, 2–3 mm, with rounded sides, not or scarcely keeled; 2n=26. Chiefly in calcareous waters; Que. and Nf. to Mack. and Alas., s. to N.J., Pa., and Ind., n. Io., Nebr., and Utah.
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Common Names
Fries' pondweed