Leaves:
Leafy stipules
Calcium carbonate concentrations
Plants are distinct male OR female plants (dioecious)
male: long, panicle like clusters
170 species
Cannabis - Hemp
Genus Cannabis
Hemp, Pot
Celtis - Hackberry
Genus Celtis
Hackberry
Gironniera
Humulus - Hop
Parasponia
Pteroceltis
Trema - Trema