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Pistia is a genus of aquatic plants in the arum family, Araceae.It is the sole genus in the tribe Pistieae which reflects its systematic isolation within the family. [5] The single species it comprises, Pistia stratiotes, is often called water cabbage, water lettuce, Nile cabbage, or shellflower.
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Free-floating macrophytes are found suspended on water surface with their root not attached to the substrate, sediment, or bottom of the water body. They are easily blown by air and provide breeding ground for mosquitoes. Examples include Pistia spp. commonly called water lettuce, water cabbage or Nile cabbage. [27]
In spite of its high water content, traditionally grown lettuce has a low water footprint, with 237 liters (52 imp gal; 63 U.S. gal) of water required for each kilogram of lettuce produced. [35] Hydroponic growing methods can reduce this water consumption by nearly two orders of magnitude.
Several species of terrestrial plants are frequently sold as "aquarium plants". While such plants are beautiful and can survive and even flourish for months under water, they will eventually die and must be removed so their decay does not contaminate the aquarium water. These plants have no necessary biology to live underwater.
Water lettuce and other aquatic plants tend to have high water content, which dilutes the nitrogen and other nutrients they contain. To account for this, S. muliplicalis has a higher feeding rate than many other Lepidoptera species. When nitrogen levels are especially low, larvae show compensatory feeding behavior, increasing their already high ...
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The stems are thin (0.5 mm diameter) and reddish, sometimes rooting in water. The primary roots are fleshy and pink, and there are numerous secondary roots with fibrous hairs. The spatulate leaves are succulent and glabrous, arranged in opposite pairs, between 2–20 mm long and 1.5–6 mm wide, with a hydathode at the tip.