Lupinus sericatus, commonly known as Cobb Mountain lupine, is a perennial herb endemic to the North Coast Ranges of California, particularly north of the San Francisco Bay Area. It is typically found in mixed evergreen forests, woodlands, and chaparral slopes and canyons, often thriving in serpentine soils which are characteristically low in nutrients and high in heavy metals. This species is well-adapted to its native habitat, which includes areas with natural disturbances such as fire. Cobb Mountain lupine reaches up to half a meter in height and is characterized by its palmate leaves with 4 to 7 spoon-shaped leaflets. The inflorescence is a raceme of several whorls of showy purple flowers, each 0 to 1 inch long, blooming in the spring and early summer. The fruit is a hairy legume pod 1 to 1 inch long, containing seeds that are dispersed by dehiscence.

Cobb Mountain lupine is valued for its ability to adapt to challenging soil conditions and is used for habitat restoration and erosion control. Its striking purple flowers make it a desirable species for native plant gardens and wildflower meadows, where it can provide a burst of color. It requires well-drained soils, tolerates drought conditions once established, and prefers full sun to partial shade. While it is not commonly affected by diseases, it can be susceptible to root rot if overwatered or planted in poorly drained soils. There are no widely known popular garden cultivars of this species.CC BY-SA 4.0