Baccharis douglasii is a species of flowering plant in the daisy family known by the common names saltmarsh baccharis and Douglas' baccharis. It is native to California, where it grows in wet places such as salt marshes. Its range may extend into Oregon. This is a rhizomatous perennial herb growing to heights between one and two meters. The lance-shaped leaves are up to about 12 centimeters long and have short winged petioles. The foliage and flower clusters are resinous and sticky. The plants are dioecious, with male plants producing clusters of up to 40 whitish staminate flowers and female plants bearing bunches of up to 150 fluffy whitish pistillate flowers with a hairlike pappus attached to each developing fruit.