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Potamogeton pusillus Linn., Sp. Pl. 127. 1753. Hook. f., l.c. 567 p.p.; Boiss., Fl. Or. 5:18. 1882 p.p.; Fernald, Gray Man. Bot. ed. 8:72. 1950; Clapham, Tutin & Warburg, Fl. Brit. Is. ed. 2:953. 1962; Dandy in Rech. f., l.c. 6; R.R. Stewart, l.c. 30; SRC, l.c. t. 31.
Potamogeton panormitanus Div.
Aquatic, perennating with axillary winter-buds. Stem filiform, c. (0.5-) 1 mm broad, branched. Leaves submerged, sessile, linear, 1-2 mm broad, tip tapering or rounded, 3(-5)-veined, midrib without lacunae. Stipules free, 6-8 mm long, 2 mm broad, ovate, acute, entire, membranous, tubular towards the base. Peduncles 1.2-3 cm long; spikes 5 mm long, few flowered, with 2-4, distant whorls. Perianth segments 1-1.5 mm long, 1-2 mm broad, broadly obtuse. Fruitlets c. 2 mm long, 1-1.5 mm broad, obovoid.
Fl. Per.: June July.
Type: “Habitat in Europae paludibus” (Sweden) Herb. Linn. no. 175/15 (LINN).
Distribution: Europe, temperate Asia, Africa and N. America.
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