Potamogeton amplifolius Tuck.

• 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 amplifolius Tuck.

• Description

  Species Description - Stem elongate, usually simple; principal submersed lvs falcately folded, 25–37-veined, 8–20 cm, on petioles 1–6 cm, acute at both ends, the lower lanceolate, 2 cm wide, the upper gradually wider; floating lvs elliptic, 5–10 cm, half as wide, obtuse, rounded at base, many-nerved, on petioles 8–20 cm; stipules axillary, free, open, 2-keeled, 3.5–12 cm, tapering to a sharp slender point; peduncles stout, 8–20 cm, somewhat clavate, 3–4 mm thick at the top; spikes dense, 2–5 cm; frs obliquely obovoid, 4–5.5 mm (incl. the 1 mm beak), with 3 low, rounded keels; 2n=52. Ponds and lakes; Que. to B.C., s. to Ala. and Calif.

• Common Names

  bigleaf-pondweed