Humulus japonicus Siebold & Zucc.
  • Fl. Jap. Fam. Nat.
  • Japanese hop(s), houblon japonais

Cite taxon page as 'WFO (2020): Humulus japonicus Siebold & Zucc. Published on the Internet; Accessed on: 29 Jan 2020'

General Information

Herbs , annual, vining, 0.5-2.5 m. Stems usually branched. Leaves: petioles usually longer than blades. Leaf blade cordate, palmately 5-9-lobed, 5-12 cm, margins of lobes serrulate, apex acuminate; surfaces abaxially with veins pubescent, with stiff hairs, glands yellow, sessile, discoid, adaxially margins of younger leaf blades with stiff cystolithic hairs. Inflorescences: staminate inflorescences erect, 15-25 cm, flower anthers without glands; pistillate inflorescences spikes, conelike, ovoid; bracteole ovate-orbiculate, 7-10 mm, pilose, margins densely ciliate-hairy. Infructescences pendulous, green, conelike, ovoid to oblong, (1-)1.5-3(-4) cm; bracteoles without yellow glands. Achenes yellow-brown, ovoid-orbicular, inflated to lenticular, 4-5 mm, glandless. 2 n = 20, including 6 chromosomes concerned with sex determination.

  • Provided by: [C].Flora of North America @
    • Source: [
    • 1
    • ]. 

    "Weedy annual vine; stem and lvs much rougher than in no. 1 [Humulus lupulus L.]; petioles commonly longer than the 5–9-lobed blades; uppermost lvs usually 3–5-lobed; mature pistillate spikes to 2 cm, their bracts relatively small, under 1 cm, densely spinulose-ciliate, dull green, conspicuously and abruptly acuminate, scarcely glandular, releasing the ripe achenes; 2n=32 (pistillate), 34 (staminate). Native of e. Asia, escaped from cult. from N. Engl. to N.C. and Mo. July–Oct."

  • Provided by: [B].New York Botanical Garden
    • Source: [
    • 2
    • ]. 

    Other Local Names

    Japanese hop(s), houblon japonais


     Information From

    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Flora of North America Association