How to Manage Pests
Identification: Weed Photo Gallery
Scientific name: Hemizonia spp. (Sunflower Family: Asteraceae)
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 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.
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.