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half life -size <br />FLATSTEM PONDWEED, <br />Potamogeton zosteriformis <br />Fresh water, inland <br />and rarely coastal; <br />Alaska to Quebec, Cali- <br />fornia, Nebraska, and <br />Virginia. <br />Stems several times <br />as wide as thick. <br />When not in bloom, <br />resembles non - blooming <br />Water- stargrass (page 79); <br />but has leaves with <br />prominent midvein and <br />non- sheathing base. <br />\\1\\/ <br />half <br />life -size <br />two times <br />life -size <br />76 <br />RIBBONLEAF PONDWEED, <br />Potamogeton epihydrus <br />Fresh water, <br />inland, particularly <br />in slow streams, and <br />rarely coastal; <br />Alaska to Quebec, <br />California, Colo- <br />rado, and Georgia. <br />The very limp <br />underwater leaves <br />have a light - colored <br />center stripe. <br />Usually there are <br />floating leaves. <br />