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Najas flexilis, <br />half life -size <br />two times <br />life -size <br />Najas gracillima, <br />half life -size <br />• <br />two times <br />life -size <br />64 <br />NAIADS, Najas <br />(except SPINY NAIAD, page 67) <br />Fresh inland water and <br />fresh to slightly brackish <br />coastal water; British Colum- <br />bia to Newfoundland, Califor- <br />nia, and Florida. <br />Six kinds resemble each <br />other so much that they can <br />be told apart only by using a <br />hand lens or microscope to <br />look at the toothing of leaf <br />edges, the shape and toothing <br />of leaf bases, and the mark- <br />ings on seeds. Tops of plants <br />are often almost out of sight <br />under water. Plants vary in <br />size from tufts an inch high <br />on sandy bottom to much - <br />branched plants two or three <br />feet high on silty bottom. <br />The six kinds are: <br />Najas conferta. Not pic- <br />tured. Southwestern Georgia <br />and western Florida. Leaves <br />usually curve out from the <br />stem, and their marginal teeth <br />are visible to the naked eye. <br />Resembles minor (page 65); but <br />the seeds are not ribbed <br />lengthwise. <br />Najas flexilis. British <br />Columbia to Newfoundland, Cali- <br />fornia, Missouri, and Virginia. <br />Leaves usually curve out from <br />the stem. Unlike the other <br />kinds, its seeds are shiny <br />under the dull, easily-rubbed- <br />off skin. <br />Najas gracillima. Minne- <br />sota to Maine, Missouri, and <br />North Carolina. Threadlike <br />leaves usually curve out from <br />the stem. Resembles flexilis; <br />but usually has slenderer <br />