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Humulus japonicus

(Japanese Hop)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Chinese:

Lü Cao

Common Names in English:

Japanese Hop, Kana-Mugura

Common Names in French:

Houblon Du Japon, Houblon Japonais, Houblon Ornemental

Common Names in Hungarian:

Japán Komló

Common Names in Italian:

Luppolo Del Giappone

Common Names in Japanese:

Kana Mugura, Kana-Mugura

Common Names in Portuguese:

Lúpulo (Brazil)

Description

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Family Cannabaceae

Herbs, annual or perennial , erect or twining , dioecious or sometimes monoecious, often with cystoliths (a hard calcium carbonate structure at base of a hair) . Stems furrowed or winged . Stipules free . Leaves alternate or opposite, palmately lobed or compound , sometimes simple . Male inflorescences a bracteate cymose panicle. Male flowers: pedicellate ; sepals 5, free; petals absent; stamens 5, opposite sepals; filaments short; anthers 2-loculed, dehiscent by longitudinal slits. Female inflorescences a bracteate spicate cyme much reduced in Cannabis, pendent or erect. Female flowers: sessile; calyx appressed to ovary, membranous; petals absent; ovary 1-loculed; ovule solitary, pendulous from locule apex; style 2-parted, branches filiform . Fruit an achene, covered by persistent calyx; endosperm fleshy ; embryo curved or spirally involute .

Two genera and four species: N Africa, Asia, Europe, North America; two genera and four species (one endemic) in China.

Because all the Chinese species in this family are cultivated and are often found naturalized in disturbed habitats , it is difficult to know the true wild distributions.

Cannabaceae has sometimes been included in Moraceae or Urticaceae but is now usually recognized as a distinct family. The subfamily Celtidoideae of Ulmaceae could possibly be included within Cannabaceae (see the discussion after the Ulmaceae family description ) .[1]

Genus Humulus

Herbs, taprooted annuals or rhizomatous perennials , rightward-twining. Stems usually branched, armed with rigid 2-branched, stalked hairs that facilitate climbing . Leaves simple ; petioles often twining , with 2-branched hairs. Leaf blade mostly cordate, palmately lobed , sometimes unlobed; surfaces abaxially resin-dotted and×or gland-dotted. Inflorescences: staminate inflorescences axillary and terminal , cymose panicles, erect to pendent, (10-) 20-100+-flowered, flowers small; pistillate axillary, spikes or racemes , flowers solitary or paired , short-pedicellate, subtended by bracts and bracteoles. Staminate and pistillate flowers usually on different plants . Achenes lenticular or terete , ensheathed by brownish or sometimes mottled persistent perianth; embryo coiled . x = 10.

Species 3: temperate Northern Hemisphere.[2]

Physical Description

Species Humulus japonicus

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. [source]

Variegated forms of Humulus japonicus, cultivated as ornamentals , are sometimes spontaneous. The vernacular name Japanese hop(s) is occasionally misapplied to H. lupulus var. cordifolius (Miquel) Maximowicz, a variety not found in North America. [source]

The disposition of the name Humulus scandens (Loureiro) Merrill, based on Antidesma scandens Loureiro, is problematic. E. D. Merrill (1935) was convinced that the name A. scandens applied to the species Humulus japonicus. If Merrill was correct, then the combination Humulus scandens would have priority . The material described by Loureiro, however, was not preserved, and his description does not coincide with that of H. japonicus. Humulus scandens is not included in synonymy in this treatment. [source]

I. A. Grudzinskaya (1988) segregated Humulus japonicus as a new monotypic genus, Humulopsis, with the single species Humulopsis scandens (Loureiro) Grudzinskaya. [source]

Habit: Vine , Forb/herb

Flowers: Bloom Period: June. • Flower Color: green

Size/Age/Growth

Size: 6-8' tall.

Habitat

Roadsides, fencerows, waste places, riverbanks; 0-1000 m [3].

Typically found at an altitude of 0 to 1,919 meters (0 to 6,296 feet).[4]

Ecology: Invasive: introduced as a cultivated plant .

Biology

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Reproduction

Duration: Annual , Perennial

Taxonomy

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Synonyms

Humulus scandens auct. non (Lour.) Merr.

Notes

Name Status: Accepted Name .

Last scrutiny: 15-Mar-2000

Similar Species

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Members of the genus Humulus

ZipcodeZoo has pages for 19 species, subspecies, varieties, forms, and cultivars in this genus:

H. japonicus (Japanese Hop) · H. japonicus 'Variegatus' (Variegated Japanese Hops) · H. lupulus (Common Hop) · H. lupulus americanus (Common Hop) · H. lupulus L. var. lupuloides E.Small (Arizona Hops) · H. lupulus L. var. neomexicanus A.Nelson & Cockerell (Common Hop) · H. lupulus var. lupuloides (Arizona Hops) · H. lupulus var. lupulus (Common Hop) · H. lupulus var. neomexicanus (Common Hop) · H. lupulus var. pubescens (Common Hop) · H. lupulus 'Apollo' (Hop 'apollo') · H. lupulus 'Aureus' (Aureus Golden Hops) · H. lupulus 'Cascade' (Hops) · H. lupulus 'Fuggle' (Hops) · H. lupulus 'Hallertauer' (Hops) · H. lupulus 'Northern Brewer' (Hops) · H. lupulus 'Nugget' (Hops) · H. lupulus 'Sovereign' (Hop 'sovereign') · H. lupulus 'Sunbeam' (Golden Hops)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 22, 2007:

Identifiers

Footnotes

  1. Zhengyi Wu, Zhe-Kun Zhou & Bruce Bartholomew "Cannabaceae". in Flora of China Vol. 5 Page 74. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Humulus". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]
  3. "Humulus japonicus". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]
  4. Mean = 249.410 meters (818.274 feet), Standard Deviation = 259.270 based on 271 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012