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Spirodela polyrrhiza (L.) Schleid. in Linnaea. 13: 392. 1839. Boiss., Fl. Or. 5: 30. 1884; den Hartog & van der Plas in Blumea 18: 360. 1970; Stewart in Nash & Ali, Ann. Cat. Vasc. Pl. W. Pak. Kashm. 36. 1972; Riedl in Rech. f., Fl. Iran. 119: 2. 1976; Landolt, l.c.; Uotila, l.c.
RIZWAN Y. HASHMI & SAOOD OMER
Lemna polyrrhiza L.
Free floating; fronds orbicular-ovate, 3-10 x 3-8 mm, asymmetrical, obtuse or rounded at apex, entire, 3-15-veined, green above, tinged with pink or purple beneath. Daughter fronds budding from the vicinity of root insertion in a slit in the mother plant. Roots 3-18 per frond. Turions produced in adverse condi¬tions; arising from lateral slits; thick, brownish or dark greenish. Flowering specimens not seen in Pakistan.
Syntypes: Described from Europe (Mich. gen. 16. t. 11. f. 1. 1729; Raj. angl. 3. p. 129. t. 4. f. z. 1724).
Distribution: Subcosmopolitan.
R.R. Stewart (l.c.) recorded that it was common in Dal Lake in Kashmir and he saw horses eating it.
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