Humulus japonicus

Common Name: 
Japanese hops
Scientific Name: 
Humulus japonicus SIEB. & ZUCC.
Family Name: 
Cannabaceae - Hemp Family
Identification Notes
Life Cycle
introduced summer annual, reproducing by seed
Stems
twining climbing or trailing, longitudinally ridged with downward pointed prickles on ridges, infrequently branching
Stems of Japanese Hops
Stems of Japanese Hops
Stems of Japanese Hops
Stems of Japanese Hops
Leaves
opposite, palmately divided, 5 to 7 lobes sometimes as few as 3, lobes oval or oblanceolate, margins toothed, long petioles with a pair of leafy bracts at base, petioles with prickles, rough hairs above, small hooked prickes on veins below
Leaves of Japanese Hops
Leaves of Japanese Hops
Leaves of Japanese Hops
Leaves of Japanese Hops
Flowers
green, inconspicuous, petal absent, dioecieous with male and female flowers on separate plants; female flowers, short spike, bracts hairy with curled tips, clusters round to oval, drooping or hanging; male flowers, 5-sepaled, large panicle, erect, spread
Flowers of Japanese Hops
Flowers of Japanese Hops