Humulus lupulus var. lupulus
Family: Cannabaceae
brewer's hop, cultivated hop
Humulus lupulus var. lupulus image
University of Wisconsin - Madison (WIS-VP)  
Etymology: Humulus: Latin name of uncertain origin, may have descended from Low German word humela, hop; which is the common name of this genus placed by Munz in the Moraceae or mulberry family, but moved by Jepson along with Cannabis into the new family Cannabaceae.
Plants: perennial herbaceous vine
Conservation Status: Introduced - persisting and spreading