Azolla filiculoides

Note: formerly Azolla caroliniana

Common Name(s): American waterfern, Pacific mosquitofern

Native to Florida

Video ID segment (2-3 minutes)

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For brief control information, see Efficacy of Herbicide Active Ingredients Against Aquatic Weeds by K. Langeland, M. Netherland, and W. Haller.

Video Transcript

American waterfern – Azolla filiculoides
There are six species of Azolla in the world. American waterfern is the species commonly found in Florida. American waterfern is a small, free-floating fern, about one-half inch in size. It is most often found in still or sluggish waters. Young plants are, at first, a bright or grey-green. Azolla plants often turn red in color. American waterfern can quickly form large, floating mats.

  • Azolla leaves are tiny, lacy-looking, and closely overlapping.
  • Azolla leaves can be green or rusty red.
  • American waterfern is a small, floating plant with green or rusty-red leaves.
  • Its leaves are tiny and overlapping.

mosquito fernView the herbarium specimen image from the University of Florida Herbarium Digital Imaging Projects.