Japanese hop: Humulus japonicus (Urticales: Cannabaceae)

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Japanese hop	USDA PLANTS Symbol: HUJA USDA ARS GRIN: 19414 ITIS: 503065 NAPIS: PAVACBA
Humulus japonicus Siebold & Zucc.
Taxonomic Rank: Magnoliopsida: Urticales: Cannabaceae
Japanese hop is an annual, climbing or trailing vine that is native to eastern Asia. This vine has 5-lobed leaves (generally), downward pointing prickles on the stem and bracts at the base of the petioles. Leaves are opposite, rough, 2-5 in. (5-13 cm) long, 5-9 lobed with toothed margins. Most leaves will have 5 lobes, but the upper leaves may only have 3. Flowers originate in the leaf axils and are green with 5 petals. Male and female flowers occur on separate plants (dioecious). Female flowers occur in cone-shaped clusters that hang down and the male flowers occur in upright flower stems. Fruit is an achene. Japanese hop was introduced into North America in the mid-to-late 1800s as an ornamental. These vines can grow to 35 ft. (10.7 m) in one growing season.

Identification, Biology, Control and Management Resources

Plant Invaders of Mid-Atlantic Natural Areas - National Park Service
Weeds Gone Wild Fact Sheet - Plant Conservation Alliance, Alien Plant Working Group
Weed of the Week - USDA Forest Service
Invasive Plant Atlas of New England - University of Connecticut
Fact Sheet - Pennsylvania Dept. of Conservation and Natural Resources

Distribution Map

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Developed by The University of Georgia - Center for Invasive Species and Ecosystem Health.
Last updated on Thursday, February 14, 2013 at 02:42 PM