Humulus japonicus Siebold & Zucc.
Family: Cannabaceae
Japanese hop
[Humulus scandens auct. non (Lour.) Merr.]
Humulus japonicus image
Robert H. Read  
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: annual, weedy, herbaceous vine; stems rough
Leaves: rough, main leaves with 5-9 lobes, stalks usually longer than the leaf blade
Flowers: dull green, 5-parted; arranged in up to 3/4" spikes; blooms July-Oct.
Invasiveness: Prohibited/Restricted Invasive - Eradicate!
Conservation Status: Introduced - escaped; ecologically invasive
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