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Potamogeton |
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Potamogeton
(pondweed), a genus of perennial aquatic herbs of the family Potamogetonaceae. The alternate leaves are petiolate or sessile and submerged or floating; they range in shape from almost round to threadlike. The inconspicuous and bisexual flowers are in spikes that are usually above the water. The perianth consists of four round valvate lobes; there are four stamens, with no filaments. The fruit consists of four drupaceous lobes. The plants are usually anemophilous. There are approximately 100 species of pondweed, distributed throughout the world in standing or slow-flowing fresh or, less often, slightly salty waters. The USSR has more than 40 species, which include the broad-leaved pondweed (P. natans), the perfoliate pondweed (P. perfoliatus), the curled pondweed (P. crispus), and the shining pondweed (P. lucens). Small animals that are eaten by fish live on the underwater parts of the plants; fish spawn in pondweed thickets. Some species are eaten by waterfowl. Pondweed thickets often hamper the movement of small boats. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | I have stated that fresh-water fish eat some kinds of seeds, though they reject many other kinds after having swallowed them; even small fish swallow seeds of moderate size, as of the yellow water-lily and Potamogeton. It is nowhere muddy, and a casual observer would say that there were no weeds at all in it; and of noticeable plants, except in the little meadows recently overflowed, which do not properly belong to it, a closer scrutiny does not detect a flag nor a bulrush, nor even a lily, yellow or white, but only a few small heart-leaves and potamogetons, and perhaps a water-target or two; all which however a bather might not perceive; and these plants are clean and bright like the element they grow in. |
Potamogeton |
potae POTAG potage potage St. Germain Potager potagers potages Potagro Potain, Pierre-Carl-Edouard Potain, Pierre-Carl-Édouard Potaissa Potala Potala Potala Palace Potale POTAM Potamian potamic potamic Potamochoerus larvatus Potamochoerus porcus potamogale Potamogale velox Potamogalidae Potamogalinae potamogenic rock Potamogeton Potamogeton americanusPotamogeton crispus Potamogeton gramineous Potamogeton nodosus Potamogetonaceae Potamogetonaceae Potamogetonales Potamography Potamoi potamology potamology Potamonidae Potamophis Potamophis striatula Potamophobia potamoplankton Potamospongiae Potance Potanin Glacier Potanin, Grigorii Potanin, Grigorii Nikolaevich Potanina, Aleksandra Potanina, Aleksandra Viktorovna Potano Potapenko, Ignatii Potapenko, Ignatii Nikolaevich | |||||||
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