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3. Lemna gibba L., Sp. Pl. 970. 1753. Boiss., Fl. Or. 5:30. 1884; Hook f., Fl. Brit. Ind. 6: 556. 1894; Dumort in Komarov, Fl. U.R.S.S. 3: 391. 1935; den Hartog & van der Plas in Blumea. 18: 362. 1970; Stewart l.c.; Landolt in Aquatic Bot. 1: 353. 1975; Riedl, l.c. 4; Landolt, l.c. 18. 1980; Uotila, l.c.
RIZWAN Y. HASHMI & SAOOD OMER
Fronds free floating, broadly ovate to orbicular, dorsal surface greenish, sometime reddish brown, asymmetrical, slightly convex, 2-7 x 2-4 mm, mostly hemispherical and strongly swollen below with large inflated hyaline cells and air spaces and usually with 40-50 meshes and with 3-5 veins; new fronds budding laterally and remaining attached to very short stipes. Flowering cavity lateral, spathe enclosing 2 staminate and 1 pistillate flower. Fruit 1-5-seeded and winged; seed ribbed, utricle rounded.
Fl. Per.: April-August.
Type: Described from Europe (Mich. gen. 15. t.11. f. 2. 1729).
Distribution: Most of Europe, South West Asia, India, Ceylon, NE & South Africa and South America.
Lemna gibba L. is easily differentiated from Lemna minor L. in being gibbous beneath, and by having larger air spaces.
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