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Potamogeton crispus Linn., Sp. P1. 120. 1753. A Bennett, Fl. Trop. Afr. 8:221. 1901; Boiss., Fl. Or. 5:17. 1882; Hook. f., Fl. Brit. Ind. 6:566. 1893; Collett, Fl. Siml, 547. 1902; Clapham, Tutin & Warburg, Fl. Brit. Is. ed. 2:956. 1962; Aalto in Acta Bot. Fenn. 36. 1970; Dandy in Rech. f., l.c. 6; R.R. Stewart, l.c. 29; Fassett, Man. Aq. Pl. 57. 1972; SRC, l.c. t. 36.
Perennial, rhizomatous aquatic. Leaves submerged, sessile, broadly linear to oblong, undulate, translucent, serrate, 3-5-veined, usually obtuse, rarely acute 4-8 mm broad. Stipules free, 2-10 mm long, Spikes 5-8 cm long, ovoid-oblong, lax. Fruitlets 4-5 mm long, 2.5-3 mm broad, ovoid, beaked; beak long, decurrent.
Type: “Habitat in Europae fossis & rivulis”.
Distribution: Europe, Asia, Africa and Australia.
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