BugwoodWiki Article

Japanese hop
Humulus japonicus Siebold & Zucc.

Overview

Appearance
Humulus japonicus 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.
Foliage
Leaves are opposite, rough, 2-5 in. (5-13 cm) long, 5-9 lobed with toothed margins. Most leaves will have five lobes, but the upper leaves may only have three.
Flowers
Flowers originate in the leaf axils and are green with five 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
Fruit is a yellow-brown ovoid achene. The small seeds are distributed by wind and water.
Ecological Threat
These vines can grow to 35 ft. (10.7 m) in one growing season, allowing them to infest large areas crowding and out competing native vegetation. Humulus japonicus was introduced into North America in the mid-to-late 1800s as an ornamental.

Resources

Selected Images


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1334129

Japanese hop
Humulus japonicus
Infestation
Chris Evans
1334130
1334130

Japanese hop
Humulus japonicus
Foliage
Chris Evans
1334131
1334131

Japanese hop
Humulus japonicus
Foliage
Chris Evans
5450071
5450071

Japanese hop
Humulus japonicus
Flower(s)
Leslie J. Mehrhoff
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1334132

Japanese hop
Humulus japonicus
Feature(s)
Chris Evans
5272026
5272026

Japanese hop
Humulus japonicus
Foliage
Leslie J. Mehrhoff
5272027
5272027

Japanese hop
Humulus japonicus
Fruit(s)
Leslie J. Mehrhoff
5450058
5450058

Japanese hop
Humulus japonicus
Flower(s)
Leslie J. Mehrhoff
5450062
5450062

Japanese hop
Humulus japonicus
Foliage
Leslie J. Mehrhoff
5272030
5272030

Japanese hop
Humulus japonicus
Infestation
Leslie J. Mehrhoff
5272028
5272028

Japanese hop
Humulus japonicus
Plant(s)
Leslie J. Mehrhoff
5307058
5307058

Japanese hop
Humulus japonicus
Seed(s)
Carole Ritchie

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Hamamelidae
Order: Urticales
Family: Cannabaceae
Genus: Humulus

Other System Links

Plants: HUJA
Bayer: HUMJA
GRIN: 19414
ITIS: 503065
NPDN Pest: PAVACBA
NPDN Host: 36694

Synonyms and Other Names

Related Scientific Names:

Humulus scandens auct.(Synonym)

Categories

Category: Vines