| Japanese hop |
USDA PLANTS Symbol: HUJA USDA ARS GRIN: 19414 ITIS: 503065 NAPIS: PAVACBA |
| Humulus japonicus Siebold & Zucc. | |
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Taxonomic Rank: Magnoliopsida: Urticales: Cannabaceae |
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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. |
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Identification, Biology, Control and Management Resources
- 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
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Foliage; Martin County, KY Chris Evans, River to River CWMA, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Martin County, KY Chris Evans, River to River CWMA, Bugwood.org Additional Resolutions & Image Usage |
 Feature(s); The down-curved bracts and sharp prickles help to identify this plant Chris Evans, River to River CWMA, Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Leaves and Inflorescences Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Martin County, KY Chris Evans, River to River CWMA, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Seed(s); Carole Ritchie, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
Taxonomic References:
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Invasive Listing Sources:
- Connecticut Invasive Plant Working Group
- Delaware Natural Resources and Environmental Control, 2004
- Indiana Native Plant and Wildflower Society
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Virginia Department of Conservation and Recreation, 1999.
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Connecticut Noxious Weeds
- Massachusetts Noxious Weeds
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