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Potamogeton natans Linn., Sp. Pl. 126. 1753. Hook. f., l.c. 565. Collett, Fl. Siml. 547. 1902; Yuzepchuk in Kom., Fl. URSS 1:200. 1934; Clapham, Tutin & Warburg, Fl. Brit. Is. ed. 2: 946. 1962; Aalto in Acta Bot. Fenn. 24. 1970; Fassett, Man. Aq. Pl. 55. 1972; Dandy in Rech. f., Fl. Iran. 83:3. 1971; R.R. Stewart, Ann. Cat. Vas. Pl. W. Pak. & Kash. 29. 1972; SRC., l.c. t. 16.
Perennial, rhizomatous aquatic. Leaves mostly dimorphic; submerged leaves if present, reduced to narrowly linear, opaque phyllodes, up to 2 mm broad; floating leaves leathery, long-petioled with a discoloured joint at the top of the petiole, ovate to lanceolate, 5-9 cm long, 3.2-4.7 cm broad; petiole up to 6 cm long. Stipules free, 5-9 cm long, persistent, linear-lanceolate. Spikes c. 4.5 cm long. Fruitlets obovoid, 3.5-4 mm long, 2.5-3 mm broad.
Fl.Per.: August-September.
Type: “Habitat in Europae lacubus & fluviis”; Herb. Linn. no. 175/1 (LINN).
Distribution: Temperate and arctic regions of Europe, Asia and N. America.
A rare species, confined to the temperate Himalayan regions of our area.
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