Vallisneria


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Related to Vallisneria: Vallisneria spiralis

Vallisneria

 

a genus of perennial plants of the Hydrocharitaceae family. They are underwater grasses with large creeping roots and linear leaves. There are six species, distributed in the fresh waters of the tropical, subtropical, and temperate regions of both hemispheres. Best known is tape grass (V. spiralis), which grows in reservoirs at depths up to 1 m. In the USSR it is found in the mouths of the Dunai, Dnieper, and Volga and in lakes in the Caucasus, Middle Asia, and the Far East. The flowers of tape grass are diclinous and develop under water, but emerge on the surface for pollination. The pollinated flower again sinks into the water, where the fruit ripens. Tape grass serves as food for fish and waterfowl and is often planted in aquariums.

References in periodicals archive ?
Vallisneria americana is unique to the Dresden reach, and provides crucial food resources (i.e., seeds and winter buds) for waterfowl, especially canvasbacks (Aythya valisneria; Korschgen et al., 1988).
pectinatus, Vallisneria spiralis, Typha angustata, and Zannichellia palustris.
In order to avoid cannibalism during molting, pieces of PVC pipe (15 x 3 cm [conjunto vacio]), stones and macrophytes such as Vallisneria gigantea, Elodea densa, aquatic Cabomba types were used as aquarium ornaments, creating a refuge for the animals.
A randomized block design transplant experiment conducted in five Adirondack lakes (Herkimer and Hamilton Counties, NY, USA) measured the relative growth rate (RGR) response of Myriophyllum tenellum, Lobelia dortmanna, Eriocaulon septangulare, Vallisneria americana, Elodea canadensis, and Potamogeton robbinsii to a dissolved inorganic carbon (D1C) gradient over the summer of 1999.
Brasenia schreberi, Vallisneria americana, Chara braunii, Ricciocarpus natans, Ceratophyllum echinatum, and Zannichellia palustris were the rarest species, occurring at <5% of the survey sites, with the latter four species having been recorded from only a single site.
Hydrilla Hydrilla verticillata Eelgrasses Vallisneria spp.
This category consisted primarily of saltmarsh cord grass (Spartina alterniflora), and smaller proportions of salt meadow-grass (Spartina patens), black needle-rush (Juncus roemerianus), salt grass (Distichlis spicata), bullrushes (Scirpus spp.), and cattails (Typha spp.); Submerged consisted primarily of shoalgrass aquatic (Halodule wrightii), wigeongrass vegetation (SAV) (Ruppia maritima), and a sporadic distribution of wild celery (Vallisneria americana); Shallow non- generally restricted to waters less vegetated than 1 meter deep, including creeks, bottom (SNB) ponds, shoreline, and open bay habitat.
Vallisneria and dwarf Sagittaria are also commonly used oxygenators.
The purpose of this project was to evaluate plant nutrient uptake of the macronutrients, phosphorus, nitrogen, and potassium on the algae (Cladophora sp.) and the aquatic plants (Vallisneria sp.