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Hoary-Mustard (Hirschfeldia)

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Hoary-Mustard Genus Details

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Hoary-mustard is a perennial introduced from western Asia into California in the early l900's. The plants have white flowers. The leaves clasp the stem and the fruit is lens-shaped. The plant spreads by seeds, root fragments and an extensive underground creeping root system. It is found in cultivated cropland, fields and pastures.

Hoary-Mustard Allergy Info

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This genus is not commonly cited as a source of allergy.

Hoary-Mustard Pollen Description

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Grains of Brassicaceae are prolate to subspheroidal; the amb rounded-triangular or with convex sides, and 3-(4)-colpate. The colpi are long, the opercula is granular and the sexine is reticulate.
Pollen grains are 24-27 x 18-19 micrometers.
Brassica juncea, single grain. Herb. MIN
Brassica juncea, single grain. 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
Hoary-Mustard (Hirschfeldia) is a genus of the BRASSICACEAE family.
This genus includes the following allergenic species:

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Hoary-Mustard 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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