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Humulus lupulus
http://www.hort.purdue.edu/newcrop/duke_energy/Humulus_lupulus.html
Description and uses of Common Hops.
Image
http://www.mobot.org/MOBOT/research/library/kohler/1763_068.jpg
Humulus lupulus L., hops. From Köhler's Medicinal Plants.
Image
http://biodiversity.uno.edu/delta/angio/images/bent502.jpg
Image - Humulus lupulus L., hops.
Wisconsin Vascular Plants: Species Details
http://wiscinfo.doit.wisc.edu/herbarium/scripts/detail.asp?SpCode=HUMLUP
Humulus lupulus L. common hop, hops.