hydrilla

Hydrilla (Hydrilla verticillata)

Similar to Elodea. Hydrilla has leaves whorled in groups of three or more. Leaves have a serrated edge with two to three pointed spines on the midrib of the underside. Whorls of leaves are compact near the growing tips. Spacing between whorls increases further down the stem.

E=Excellent, G=Good, F=Fair