Humulus lupulus L.
Family: Cannabaceae
common hop, hop
Humulus lupulus image
Steve C. Garske  
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: twining, perennial, up to 30' tall, herbaceous vine
Leaves: opposite, stalk shorter than the leaf blade; main leaves 3-lobed, as wide as long, and with a heart-shaped base
Flowers: green, 5-parted; inflorescence branched clusters from the leaf axils, male flowers loosely arranged, female more compact and fewer; blooms July-Aug.
Fruits: sepals overlapping the dry seed
Habitat: moist; disturbed sites, woods, fencerows
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native