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• <br />COMMON ELODEA, Elodea canadensis <br />(Elodea nuttallii; Philotria <br />canadensis and linearis) <br />Fresh to slightly alkali inland <br />water and fresh to slightly brackish <br />coastal water; British Columbia to <br />Quebec, California, and Florida. <br />Leaves vary greatly in width, <br />size, and bunching; therefore plants <br />are often slimmer or stouter than <br />as pictured. Sometimes there are <br />slim seed pods at the base of leaves. <br />Big plants resemble small plants <br />of South American Elodea (page 68); <br />but toward the tip of stems the <br />leaves of Common are in twos or <br />threes at a joint, those of South <br />American are in fours or fives. <br />Plants with narrow, limp leaves re- <br />semble underwater forms of Water - <br />starworts (page 61); but Elodea <br />leaves are bunched toward the tip of <br />stems and usually are in threes at <br />a joint. Resembles large plants of <br />Micranthemum (page 70); but Elodea <br />leaves are usually bunched at the <br />end of branches. <br />life -size <br />66 <br />GOLDENPERT, Gratiola aurea <br />Fresh water; Wisconsin to <br />Newfoundland, Alabama, and <br />Florida (but only near the <br />coast in the southeastern <br />states). <br />Sometimes grows in several <br />feet of water, where it is <br />an inch or two high and has <br />sharp- tipped leaves and no <br />flowers. Usually grows out <br />of water or partly out; then <br />is bigger and has blunt - <br />tipped leaves and yellow <br />flowers. <br />