Diversity:  A family of 2 genera and 3 species of erect (Cannabis) or scandant (Humulus) herbs, both annual and perennial (Humulus).

Distribution:  North temperate with Cannabis and one species of Humulus native to the Old World and another species of Humulus a native North American.

Floral structure:

Significant features:  Highly reduced, pentamerous (5-parted), unisexual flowers; species dioecious.  Leaves with a palmate pattern of organization.  A family of minimal floristic significance, but representative of the Order (herbaceous).  However, due to the presence of complex, resin producing glandular trichomes, the Cannabaceae is of ethnobotanical interest in that both genera are associated with human intoxicants; hops and marijuana and other applications (fiber, oil - Cannabis).  Sometimes included within the Moraceae.
 
 
  Cannabis - overview from Flora von Deutschland Österreich und der Schweiz (1885)

Cannabis sativa - staminate inflorescence and flower at anthesis

Cannabis sativa - pistillate inflorescence and flower at anthesis

Humulus - overview from Carl Lindman's Bilder ur Nordens Flora
 

More information on the Cannabaceae