azolla is a floating fern plant. it grows floating on the surface of water in tropical and subtropical waters

abstract animal aquatic azolla azollaceae background biodiversity biology botanical botany detail duckweed environment farm feed fern ferns fertilizer float floating flora foliage fresh garden green greenery grow growing grows growth leaf lush manure mosquito natural nature organic outdoor pattern pinnata plant pond seaweed subtropical surface swamp texture tropical velvet wallpaper water waters weed