Definitions for vallisneria
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Vallisneria, genus Vallisneria(noun)
eelgrass; eel grass
Vallisneria is a genus of freshwater aquatic plant, commonly called eelgrass, tape grass or vallis. The genus has 6-10 species that are widely distributed, but do not grow in colder regions. Vallisneria is a submersed plant that spreads by runners and sometimes forms tall underwater meadows. Leaves arise in clusters from their roots. The leaves have rounded tips, and definite raised veins. Single white female flowers grow to the water surface on very long stalks. Male flowers grow on short stalks, become detached, and float to the surface. The fruit is a banana-like capsule having many tiny seeds. Sometimes it is confused with the superficially similar Sagittaria when grown submerged. This plant should not be confused with Zostera species, marine seagrasses that are usually also given the common name "eelgrass".
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