Erigeron howellii is a rare North American species of flowering plant in the aster family known as Howell’s fleabane. It has been found in the Cascades in the northwestern United States, in northwestern Oregon and southwestern Washington. Erigeron howellii is a perennial herb up to 50 centimeters (20 inches) tall, spreading by means of underground rhizomes. Each plant generally produces only one flower head, with up to 50 white ray florets surrounding numerous yellow disc florets.