Distribution: Occurring chiefly west of the Cascades in Washington, but also in the Columbia River Gorge; Vancouver Island, British Columbia south to California, east to Idaho.
Habitat: Dry, open areas at lower elevations.
Growth Duration: Annual
Conservation Status: Not of concern
Erect, slender, sparingly-branched annual, the glabrous to stipitate-glandular stem 1.5-10 dm. tall.
Leaves basal and cauline, the lower bipinnatifid with slender rachis and narrow ultimate segments; reduced upward and becoming pinnatifid.
Flowers sessile in dense, 50- to 100-flowered heads terminating the stem and branches; corolla bluish, 6-10 mm. long, the 5 slender lobes about equaling the tube; calyx with prominent translucent intervals between the 5 herbaceous segments; filaments inserted in the sinuses of the corolla, about equal to the lobes; style 3-parted; ovary superior.
Capsules with 3 carpels, each with 2, 3 or 0 seeds.