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2. Azolla filiculoides Lamarck, Encycl. 1: 343. 1783.
细叶满江红 xi ye man jiang hong
Azolla japonica Franchet & Savatier; A. pinnata R. Brown var. japonica (Franchet & Savatier) Franchet & Savatier.
Plants more robust than Azolla imbricata. Lateral branches axillary, numbers of lateral branches less than fronds of stem; when in shallow water or wet places or plants in crowded situations, stems becoming erect and dorsal lobes changing to ventral ones. Sporangium with 3 floats on exospore; massulae of microsporangium covered with anchorlike hairs.
Cultivated and escaped, rice fields, ponds, ditches. Widely distributed in the Chang Jiang valley, also in S China, including Taiwan [Japan; NE Asia, Europe, North and South America, Pacific islands].
The whole plant of Azolla filiculoides is used as green manure and forage.
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