|Pteridophyte|| Literature for Azolla filiculoides
Common name(s): mosquito ferns, mosquito ferns
|Distribution||Native to the United States, western Canada, Mexico, and Central and South America and purposely brought to Hawai'i as part of a mosquito control program in rice fields early in the twentieth century.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.|
|Habitat||Taro patches, irrigation ditches, and ponds|
||Stems branching pinnately, alternately, bearing threadlike roots.
||Fronds overlapping, 1.5-5 cm long; pinnae overlapping, 2-lobed, 0.5-1.5 mm long, the upper lobes oblong-ovate, yellowish green, pink, or dark red, upper side convex, underside deeply concave, lower (submerged) lobes larger, pale green to whitish, delicately membranous, glabrous.
||Latin felix, fern, plus -ulus, diminutive suffix, plus -oides, like, resembling; the plant is a little fern.