Deinandra lobbii, called threeray tarweed, is a North American species of plants in the tarweed tribe within the (sunflower family). It is endemic to California, though with a disjunct (discontinuous) distribution. It has been found in the northeastern part of the state (Modoc, Lassen, and Shasta Cos. ) the San Francisco Bay region (Solano, Contra Costa, and Alameda Cos. ) and west-central region (Monterey, San Benito, and northern San Luis Obispo Cos). Calflora also reports a collection from Santa Clara County but this is from the central part of the campus of Stanford University, hence most likely a cultivated specimen. Deinandra lobbii is an annual herb up to 70 cm (28 inches) tall. It has numerous flower heads in a showy array. Each head has 3 (occasionally 4) yellow ray florets plus 3 (occasionally 4) disc florets with yellow corollas and red or dark purple anthers.