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Hippuris vulgaris Linn., Sp. P1. 4. 1753. Boiss., Fl. Or. 5. 755. 1884; Clapham, Tutin & Warburg, Fl. Brit. Is. ed. 2. 486. 1962; Fernald in Gray, Man. Bot. ed. 8. 1076. 1950; Kitamura, Fl. W. Pak. & Afgh. 108. 1964; Rech. f., Fl. Iran. 31:1. 1966; Fassett, Man. Aq. P. ed. 2. 63. 1972.
Variable, heterophyllous, wholly or partly submerged. Rhizome creeping, stout. Leaves 6-12 in a whorl, sessile, 6-16 mm long, 1-2 mm broad, entire, glabrous; submerged leaves longer and thinner. Flowers in the axils of short rigid emergent leaves. Anther bilobed. Fruit ovoid, 1.5-2 mm long, 1-1.5 mm broad.
Fl.Per.: July-August.
Type: “Habitat in Europae fontibus” (Lappland).
Distribution: Most of Europe and Asia, N. Africa, N. America.
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