Salvinia

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Related to Salviniaceae: Salviniales

Salvinia

 

the only genus of the family Salviniaceae—a family of aquatic heterosporous ferns. The plants are rootless annuals or perennials. The leaves are closely arranged on the rhizome in whorls of three: two are entire and floating, and one is sporiferous and dissected into narrow rootlike lobules, which are submerged in the water. Some of the interior segments of the leaves bear spherical sporocarps containing microsporangia and megasporangia. There are about ten species, distributed in tropical America and Africa and, to a lesser degree, in North America and Eurasia. The USSR has one species—S. natans.

References in periodicals archive ?
However, tropical environments are threatened by floating plants, such as some Salviniaceae species, which are more efficient in absorbing nutrients.
A stage 1 endodermis is found in Equisetaceae, Lycopodiaceae, Osmundaceae, Marsileaceae, and Salviniaceae.
Previously, the most widely accepted view was that Azolla belonged to the family Salviniaceae and consisted of two subgenera and six living species (Lumpkin & Plucknett, 1980).
Noteworthy exceptions to this appear to be the water ferns (Azollaceae, Salviniaceae, and Marsileaceae), which are reported to possess prominent apical cells with two cutting faces (Croxdale, 1978, 1979; von Guttenberg, 1966; Schmidt, 1978).
5% of the species recorded and together with Pontederiaceae, Salviniaceae and Potamogetonaceae, had the highest frequencies of occurrence in all arms (Fig.