Potamogeton crispus L.

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Potamogetonaceae

• Scientific Name

  Potamogeton crispus L.

• Description

  Species Description - Stems compressed, 3–8 dm, sparingly branched; rhizomes elongate and slender; lvs all submersed, linear-oblong, 3–8 cm × 5–12 mm, rounded or obtuse to minutely cuspidate, finely and irregularly toothed and rather crisply undulate-margined, narrowed or rounded to a sessile base, 3–5-veined; stipular sheaths 3–8 mm, adnate at base to the lf, scarious, soon disintegrating; hard winter-buds commonly produced; peduncles 2–5 cm, often recurved in fr; spike dense, 1–2 cm; body of the achene ovoid, 3 mm, shallowly pitted, with 3 round dorsal keels, the central one prolonged at base into a projecting appendage; achene-beak erect, conic, 2–2.5 mm; 2n=52. Native of Europe, locally intr. in alkaline or high-nutrient waters nearly throughout our range.

• Common Names

  curly pondweed