KEY TO THE SPECIES

1	Leaf tip rounded, more or less serrulate; lateral teeth faintly developed or absent; leaves 0.6-1.2 mm wide Halodule pinifolia
1'	Leaf tip tridentate: median tooth obtuse (but in very narrow specimens often acute), shorter than or as long as the linear lateral teeth; leaves 0.25-3.5 mm wide. Halodule uninervis