Azolla mexicana

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Azolla mexicana
Azolla mexicana.jpg
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Polypodiopsida /
Pteridopsida (disputed)
Order: Salviniales
Family: Azollaceae
Genus: Azolla
Species: A. mexicana
Binomial name
Azolla mexicana
Schltdl. & Cham. ex Kunze
  • Azolla mexicana Schltdl. & Cham. (invalid nomen nudum)
  • Azolla mexicana C. Presl (illegitimate homonym)

Azolla mexicana is an aquatic fern native to Mexico, British Columbia and the western United States (California, Oregon, Washington, Arizona, New Mexico, Texas, Utah, and Nevada). [2]

There are reports of the species also occurring in the Great Plains of the central United States, but these reports need further study for verification.[2]


Azolla mexicana is a floating aquatic with blue-green to dark red leaves. It is distinguished from the two other species of the genus present in North America, Azolla caroliniana and Azolla filiculoides, by having multicellular hairs on the leaves and pits on the megaspores.[3][4][5]


  1. ^ Tropicos
  2. ^ a b Flora of North America v 2
  3. ^ Svenson, H. K. 1944. The New World species of Azolla. American Fern Journal 34: 69--84.
  4. ^ Zimmerman, W. J., T. A. Lumpkin, and I. Watanabe. 1989. Classification of Azolla spp., section Azolla. Euphytica 43: 223--232.
  5. ^ Kunze, Gustav. Linnaea 18(3): 352. 1845.