Quote:
Originally Posted by rsivertsen
Hey Arvin, water lettuce (Pistia stratiotes) is actually in the fern allies group, along with Azola and Salvinea which reproduce so rapidly that they are illegal in several states here in the USA, considered as aggressive invasive exotics.
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Just to correct a common misconception - Pistia is a member of the aroid (Araceae) family. This group of plants have very diverse forms which include caladiums, Zamioculcas (the feng shui plant frm Zanzibar, lol), the devil's ivy, and arum lilies. Pistia produce rather small flowers that has a spathe and spadix (the di*ck in a sheath flower type). It is a monocot. Duckweed (lemmna) and watermeal (wolffia) are other examples of aquatic aroids.