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(waterthyme) <br /> Hydrilla verticillato (L.f.) <br /> Royle <br /> Invasive <br /> Federal Noxious Weed <br /> Noxious in 17 states <br /> A submersed, rooted, <br /> perennial aquatic plant <br /> with a very fast growth ,.. <br /> rate. The stems grow <br /> quickly to the surface of <br /> the water and spread lat- <br /> erally. Hydrilla is one of ._ <br /> the most invasive plants <br /> infesting waterways in <br /> TM <br /> the Carolinas. There are <br /> two biotypes: monoe- M <br /> cious and dioecious. <br /> The dioecious biotype is <br /> more robust. .t <br /> Leaves: Oblong, sessile, i. <br /> and whorled in groups of <br /> 4 to 8 around the stem. � � <br /> Leaf margins are serrated, <br /> and color can range from <br /> light to dark green and even reddish depending <br /> upon the environment. <br />