Azolla is a free floating pterophyte. There are six species of genus Azolla. Off them, only one Azolla pinnata is found in various water bodies of Bangladesh. They are unattached and float with their leaves with above the water surface
Duck weeds in Bangladesh
Duck weeds are the group of floating plants belonging to the genera Lemna, Azolla and Wolffia (Singh and Mittal, 1999). But Das (1997) mentioned Lemna, Spirodela, Wolffia and Wolffiella genus as duck weeds. So far, a total of 34 species