On Species of the Seagrass, Halodule, in Florida

Three vegetative leaf characters previously used to separate species of the seagrass, Halodule Endlicher, are shown to vary on the same plant, and also on plants in different environments, to such a degree that they cannot be used as species characters. These characters are: leaf width, apex morphology, and the presence or absence of lacunae around the mid-vein. It is the opinion of the writer that all Halodule plants which he has seen from Florida waters belong to H. wrightii Ascherson.