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Azolla caroliniana is a small floating fern housing
blue-green algae in its leaves. This algae is
capable of absorbing nitrogen from the air, which can then be used by the
plant. Water resistant. A. caroliniana now occurs all over the
tropics, where it has become a menace because it covers lakes and deprives
the original aquatic plants of light. Used as nitrogen fertiliser in rice paddies, and some varieties used as animal feed. Several
related varieties on the market, with similar appearance. A decorative plant
for open aquariums.
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