Vegetative key to the families >
Vegetative Key Vegetative key to the families
FREE FLOATING WATER PLANTS; roots, when present, not rooted in the mud. (Note: there are 2 genera of ferns which are free floating, see Azolla and Salvinia)
Whole plant not exceeding 5 mm long Lemnaceae
Roots absent Wolffia
Cladode widest at the water surface, at least twice as deep as wide
Cladodes green, shining on the upper surface, up to 1 mm long, ± convex, rounded on the edges, with 50–80 stomata on the upper surface. Widespread. Still water, usually in grazing land Wolffia australiana