Included' phloem absent. Xylem with libriform fibres. Vessel end-walls simple. Vessels without vestured pits. Reproductive type, pollination .
Unisexual flowers present .
Plants dioecious, or androdioecious, or polygamomonoecious. Gynoecium of male flowers absent. Inflorescence, floral, fruit and seed morphology . Inflorescences crowded fascicles on long, leafy branches. The pistil 1 celled.