Jepson eFlora: Taxon page
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Humulus lupulus

Higher Taxonomy
Family: CannabaceaeView DescriptionDichotomous Key

Common Name: HEMP FAMILY
Habit: Tree, shrub, or erect or twining perennial herb; dioecious or flowers staminate and bisexual, wind-pollinated; epidermis with stiff hairs, glandular or not; sap watery. Leaf: petioled; simple, unlobed or palmately lobed or compound, all alternate or lower opposite. Inflorescence: terminal or axillary, unisexual or with both male and bisexual flowers. Flower: perianth parts 4--6, free or fused; stamens 0 or 4--6; ovary 0 or 1, superior, chamber 1, ovule 1, style 1, short, stigmas 2, slender, plumose. Fruit: drupe or achene, occasionally +- enclosed in persistent perianth.
Genera In Family: 11 genera, +- 100 species: temperate, tropical areas worldwide.
eFlora Treatment Author: Alan T. Whittemore, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: HumulusView Description 

Common Name: HOP
Habit: Annual, perennial herb, twining herbaceous vine, hairs occasionally forked. Leaf: lower opposite, palmately 3--5-lobed, upper alternate, unlobed. Staminate Inflorescence: panicle, +- open. Pistillate Inflorescence: head- or cone-like, generally pendent (erect). Pistillate Flower: perianth parts fused into short, unlobed tube or ring, persistent. Fruit: enclosed in enlarged perianth subtended by papery bract.
Species In Genus: 2 species: northern temperate. Etymology: (Probably latinized from Low German: hop)
eFlora Treatment Author: Alan T. Whittemore & Elizabeth McClintock

Humulus lupulus L.
Habit: Perennial herb. Leaf: generally 3--5-lobed; blade +- cordate, coarsely serrate. Pistillate Inflorescence: 2.5--5 cm, +- oblong in fruit.
Ecology: Uncommon. Disturbed places, persisting from cultivation; Elevation: < 3000 m. Bioregional Distribution: NCoRO, CaR, n&c SN, SCo, WTR, SnGb; Distribution Outside California: native to Eurasia. Flowering Time: Apr--Aug Note: Ornamental vine and cultivated as major flavor source for beer.
Synonyms: Humulus lupulus var. lupulus; Humulus lupulus var. neomexicanus A. Nelson & Cockerell
eFlora Treatment Author: Alan T. Whittemore & Elizabeth McClintock
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Citation for this treatment: Alan T. Whittemore & Elizabeth McClintock 2016. Humulus lupulus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 30, 2016.

Humulus lupulus
click for enlargement
© 2010 Barry Breckling
Humulus lupulus
click for enlargement
© 2009 Barry Breckling
Humulus lupulus
click for enlargement
© 2010 Barry Breckling

More photos of Humulus lupulus in CalPhotos

Geographic subdivisions for Humulus lupulus:
NCoRO, CaR, n&c SN, SCo, WTR, SnGb;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.