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Hop (Humulus)

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Hop Genus Details

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Humulus is a twining, rough perennial herb with simple, opposite leaves. It is found growing wild in open or wooded, moist areas, along roadsides, streams and river banks. The plant is cultivated for the resinous material in the flowers which is used to make beer.

Hop Allergy Info

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Exposure can produce a reaction similar in severity to reactions to cannabis among sensitized individuals.

Hop Pollen Description

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Grains are suboblate to oblate; the amb rounded triangular to circular and 3-4 porate. The pores are circular to oval. The intine is thickened below the pores, forming an onci. Grains of Humulus and Cannabis are very similar and resemble pollen of the Moraceae family.
Grains are 14-23 x 20-28 micrometers in size.
Humulus lupulus, single grain. Herb. MIN
Humulus lupulus, single grain. Herb. MIN
Humulus lupulus, multiple grains. Herb. MIN
Humulus lupulus, multiple grains. Herb. MIN

Species in This Genus

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Allergenicity Legend:
Mild Allergen Mild Allergen  |  Moderate Allergen Moderate Allergen  |  Severe Allergen Severe Allergen  |  Allergy Test Allergy Test Available
Hop (Humulus) is a genus of the CANNABACEAE family.
This genus includes the following allergenic species:

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Hop Genus Location

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The shaded areas on the map indicates where the genus has been observed in the United States. Click the map to see a full scale version of these allergy areas.
  - Native, observed in a county
  - Introduced, observed in a county
  - Rarely observed

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