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Potamogeton lucens Linn., Sp. Pl. 126. 1753. Boiss., l.c. 16; Hook. f., l.c. 567; Collett, Fl. Simi. 448. 1902; Yuzepchuk in Kom., Fl. URSS. 1:202. 1934; Clapham, Tutin & Warburg, Fl. Brit. Is. ed. 2: 948. 1962; Aalto in Acta Bot. Fenn. 30. 1970; Dandy in Rech. f., l.c. 4; R.R. Stewart, l.c. 29; SRC, l.c. t. 20.
Perennial, rhizomatous aquatic. Stem branched. Leaves shortly petiolate to subsessile, translucent, net-veined, veins 7 or more, minutely dentate at margin, lanceolate to elliptic or obovate-elliptic, 6-9 (-14.5) cm long, 2-3 cm broad, acute or acuminate. Stipules free, lanceolate, 2.5-5.7 cm long, 6-9 mm broad, subobtuse, 2-keeled. Spikes, cylindric, dense, c. 3 or more cm long. Fruitlets 2.5-4 mm long, 2.5-3 mm broad, shortly beaked, shape variable from obovoid to almost rounded, beak decurrent, central.
Fl. Per.: July-August.
Type: Habitat in Europae lacubus, stagnis, fluviis argillosis.
Distribution: Europe, N. Africa and temperate Asia.
The plants are used for manuring and in pisciculture.
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