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1b. Najas marina var. grossidentata Rendle, Trans. Linn. Soc. London, Bot. 5: 396. 1899.
粗齿大茨藻 cu chi da ci zao
Stems stout, with only 1 or 2 spines under nodes. Margins of leaves with 2 or 4 teeth, abaxial side of midvein with sparse spines. Style and stigma 2-3 mm; anthers 3.8-4 mm. Seeds 4-4.5 × 2.2-2.4 mm.
Ponds, lakes. Heilongjiang, Jilin, Liaoning [Korea].
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