Potamogeton pulcher Tuck.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems rarely over 5 dm, simple, black-spotted; submersed lvs narrowly lanceolate, undulate-margined, 8–15 × 1–3 cm, 9–19-veined, long-acuminate, tapering at base to a poorly defined petiole; floating lvs broadly elliptic or oval, 4–8 × 2–5 cm, many-veined, obtuse, the base broadly obtuse to subcordate; petioles stout, black-spotted, 2–8 cm; stipules axillary, free, to 6 cm, cuspidate to long-acuminate; peduncles 5–12 cm, somewhat thicker than the stem; spike dense, cylindric, 2–4 cm; frs obliquely obovoid, 3.5–4.5 mm (beak included), with flat sides and 3 low, sharp dorsal keels. Shallow, acid waters and muddy shores; s. Me. to Fla. and Ala., chiefly near the coast; s. Ind. to Mo. and Ark. Shore-forms may lack lvs of the submersed type.