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How to Manage Pests

Identification: Weed Photo Gallery

| Weed Photo Gallery | Key to weeds in turf |

Tarweeds

Scientific name: Hemizonia spp. (Sunflower Family: Asteraceae)

Click on image to enlarge

Life stages of Tarweeds parrys tarweed flower threeray tarweed flower parrys tarweed seed fitchs tarweed seed fitchs tarweed seedling

Tarweeds, which include several species in the sunflower family, occur throughout California and are found in rangelands, pastures, and roadsides. All have sticky, heavily scented leaves. Shown here is three-rayed tarweed.

Mature plant

Mature tarweeds range from about 1 to 1-1/2 feet (30–45 cm) high. Lower leaves are deeply lobed and lancelike. Upper leaves are flattened against the stem, glandular and hairy.

Flower

The petals have three-toothed edges and may be yellow or white depending on the species and variable in number from three to many per flower.

More information

Statewide IPM Program, Agriculture and Natural Resources, University of California
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