common hop

(Humulus lupulus var. lupuloides)

Conservation Status


No image available

  IUCN Red List

not listed


N4? - Secure

SNR - Unranked


not listed

Wetland Indicator Status
  Great Plains

FACU - Facultative upland


FACU - Facultative upland

  Northcentral & Northeast

FACU - Facultative upland


Common hop (var. lupuloides) is a perennial vine that rises from a stout rhizome. It dies back to the ground each year.

The stem is stout, non-woody, light green, and branched. It is solid at maturity and usually finely ridged or angled. It is rough and prickly to the touch, and is sparsely to moderately covered with stiff, 2-branched hairs on the ridges. Each hair has two rigid branches that spread in opposite directions. These hairs facilitate climbing by anchoring the vine to adjacent plants or structures. The stem is hairiest at the nodes, and is hairless or minutely hairy between the branched hairs. It climbs by turning clockwise at the tip (twining). Charles Darwin observed that it made a complete revolution every 128 minutes during daytime in hot weather.

Leaves are opposite, broadly egg-shaped in outline, and heart-shaped at the base. They are on to 3 long leaf stalks (petioles). The petioles are usually shorter than the leaf blades. They are sometimes twining and, like the stem, are covered with stiff, 2-branched hairs. At the base of each leaf is a pair of lance-shaped, leaf-like appendages (stipules). The stipules are sometimes fused, appearing as a single stipule. Leaf blades are 1¼ to 6 long, and ¾ to 5 wide. They are mostly palmately divided into usually 3, rarely 5, lobes. The lobes taper to a point at the tip and are somewhat narrowed at the base. Leaves that are 4 long or longer usually have fewer than 5 lobes. Smaller leaves are sometimes unlobed. Leaves 2 long or shorter often have no more than 3 easily visible secondary veins branching off of the midrib, not counting branches near the base. The upper surface of the leaf blade is rough to the touch and is sparsely covered with stiff, prickly hairs. The lower surface is not rough to the touch. It is sparsely to moderately covered with short, fine, soft, white hairs along the veins and hairless but with yellow glands between the veins. The margins are toothed with sharp, forward pointing teeth.

Male and female flowers are borne on separate plants. The male inflorescence is loose, branched cluster (panicle) of 20 to 100 or more flowers at the end of the stem and drooping from leaf axils. The panicles are 1¼ to 6 long, and ¾ to 1¼ wide. The female inflorescence is a pair of dense, cone-shaped, to ¾ long spikes (aments) drooping from leaf axils. The ament consists of overlapping, dull green bracts.

Male flowers are star shaped, 1 32 to long, and about ¼ wide. There are 5 yellowish- or whitish-green sepals, no petals, and 5 stamens with glandular anthers. Female flowers consist of an ovary with a long, slender stigma. They are paired between overlapping bracts of the ament.

The ament elongates when in fruit, becoming to 2 long. The bracts are to ¾ long, egg-shaped, and hairless along the margins. The fruit is a yellowish, broadly egg-shaped to nearly spherical achene enclosed in a persistent, enlarged calyx and covered by a papery bract. It is covered with yellowish to orangish stalked glands that secrete a bitter substance, lupulin, used to flavor beers.




Climbing: 3 to 20 long


Flower Color


Yellowish or whitish


Similar Species


Common hop (Humulus lupulus var. pubescens) lower leaf surface is conspicuously hairy. It is densely hairy along the veins and is also hairy between the veins.

Japanese hop (Humulus japonicus) is an annual. The petiole is as long or longer than the leaf blade. The leaf blade has 5 to 9 lobes. The leaf underside is rough to the touch with stiff, prickly hairs along the veins. The margins on the ament bracts are densely hairy. The bracts, anthers, and achenes are not glandular.


Moist. Thickets, woodland borders, riverbanks, wooded bluff slopes, fencerows, railroads, disturbed areas. Partial sun.




July to August


Pests and Diseases






Distribution Map



4, 7, 28, 29, 30.









  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Magnoliopsida (flowering plants)  
  Superorder Rosanae  


Rosales (roses, elms, figs, and allies)  


Cannabaceae (hackberry)  


Humulus (hops)  
  Species Humulus lupulus (common hop)  

Subordinate Taxa






Humulus americanus

Humulus lupulus ssp. americanus


Common Names


Arizona hops

common hop




Hop or Hops?

Both “hop” and “hops” are correct common names for Humulus lupulus. The word “hop” can refer to the plant itself, the female flowers of the plant, or the dried female flowers that are used to flavor beer. The plural form “hops” is often used to refer to the dried female flowers.
— Bard, Google AI






A dry, one-chambered, single-seeded seed capsule, formed from a single carpel, with the seed attached to the membranous outer layer (wall) only by the seed stalk; the wall, formed entirely from the wall of the superior ovary, does not split open at maturity, but relies on decay or predation to release the contents.



A cylinder-shaped, spike-like inflorescence bearing unisexual flowers that have no petals.



The upper angle where a branch, stem, leaf stalk, or vein diverges.



Modified leaf at the base of a flower stalk, flower cluster, or inflorescence.



The group of outer floral leaves (sepals) below the petals, occasionally forming a tube.



Similar to a hand. Having more than three lobes or leaflets that radiate from a single point at the base of the leaf.



A pyramidal inflorescence with a main stem and branches. Flowers on the lower, longer branches mature earlier than those on the shorter, upper ones.



On plants: The stalk of a leaf blade or a compound leaf that attaches it to the stem. On ants and wasps: The constricted first one or two segments of the rear part of the body.



A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.



An outer floral leaf, usually green but sometimes colored, at the base of a flower.



A small, leaf-like, scale-like, glandular, or rarely spiny appendage found at the base of a leaf stalk, usually occurring in pairs and usually dropping soon.



Growing in a spiral usually around a stem of another plant that serves as support.

Visitor Photos

Share your photo of this plant.

  This button not working for you?
Simply email us at
Attach one or more photos and, if you like, a caption.












Visitor Videos

Share your video of this plant.

  This button not working for you?
Simply email us at
Attach a video, a YouTube link, or a cloud storage link.


Other Videos



Visitor Sightings

Report a sighting of this plant.

  This button not working for you?
Simply email us at
Be sure to include a location.








Last Updated:

© All rights reserved.

About Us

Privacy Policy

Contact Us