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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.
The purple, non-fragrant, invasive flowers of the "Phaseolus giganteus" are said to have snail or snail-shell shaped flowers, hence the origin of the common name.The multicolored, fragrant, non-invasive flowers of the Cochliasanthus caracalla are said to have corkscrew or nautilus-shell shaped flowers, hence the origin of that common name.
An edible seed [n 1] is a seed that is suitable for human or animal consumption. Of the six major plant parts, [n 2] seeds are the dominant source of human calories and protein. [1] A wide variety of plant species provide edible seeds; most are angiosperms, while a few are gymnosperms.
Some plants that are generally edible can cause allergic reactions in some individuals. U.S. Army guidelines advise to test for contact dermatitis, then chew and hold a pinch in the mouth for 15 minutes before swallowing. If any negative effect results, it is advised to induce vomiting and drink a high quantity of water. [1]
Limnobium laevigatum is a floating aquatic plant, which can be mistaken for water hyacinth (Eichornia crassipes) due to their superficial similarity.Juvenile plants grow in rosettes of floating leaves that lie prostrate upon the water surface, a distinguishing character of the juvenile plant is the presence of spongy aerenchyma tissue upon the abaxial surface (underside) of the leaf.
Stems support the entire plant and have buds, leaves, flowers, and fruits. Stems are also a vital connection between leaves and roots. They conduct water and mineral nutrients through xylem tissue from roots upward, and organic compounds and some mineral nutrients through phloem tissue in any direction within the plant.
Some still-water plants can alter their position in the water column at different seasons. One notable example is Water soldier which rests as a rootless rosette on the bottom of the water body but slowly floats to the surface in late Spring so that its inflorescence can emerge into the air.
The new tips of watercress leaves can be eaten raw or cooked, [22] although caution should be used when collecting these in the wild because of parasites such as giardia. [23] Watercress is 95% water and has low contents of carbohydrates , protein , fat , and dietary fiber .