Stem anatomy . Internal phloem absent. Included' phloem absent. Vessel end-walls scalariform, or simple, or scalariform and simple. Reproductive type, pollination .
Unisexual flowers present .
Inflorescence, floral, fruit and seed morphology . Androecium exclusively of fertile stamens. Gynoecium 2 carpelled. The pistil 1 celled. Polar nuclei fusing prior to fertilization.