Salviniales

The order Salviniales (formerly known as the Hydropteridales and including the former Marsileales) is an order of ferns in the class Polypodiopsida. Salviniales are all aquatic and differ from all other ferns in being heterosporous, meaning that they produce two different types of spores (megaspores and microspores) that develop into two different...
Found on http://en.wikipedia.org/wiki/Salviniales

Salviniales

plant order containing two families of tiny ferns that float on water: Salviniaceae and Azollaceae, each consisting of one genus. Salvinia (water ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/s/17
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