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Updated: May 17, 2025
"The canvass-back is known in natural history as Anas valisneria, and this specific name is given to it because it feeds upon the roots of an aquatic plant, a species of `tape-grass, or `eel-grass; but botanically called `Valisneria, after the Italian botanist, Antonio Valisneri.
They spread over the surface, forming a rich green ceiling, grow freely, and last for months. They are continually throwing out new roots and shoots, and create abundance of oxygen. Whenever desired, they can be got rid of by simply lifting them out. The Vallisneria, or Tape-Grass, common in all our ponds, is essential to every fresh-water tank.
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