The Families of Flowering Plants - Trapaceae Dum. The Families of Flowering Plants L. Watson and M. J. Dallwitz Trapaceae Dum. Leaves submerged and floating. Leaf anatomy . The mesophyll crystals druses.
Minor leaf veins without phloem transfer cells.
Stem anatomy . Secondary thickening absent. Xylem with vessels. Vessel end-walls simple. Reproductive type, pollination .