Layia glandulosa from roadside just north of the Vernita Bridge, Columbia River, central Washington...........5-1-98.
White layia is a branched annual with spreading hairs and glandular herbage. It ranges in height from 5-40 cm. The leaves are 1-6 cm long. They are narrow and pinnatifid or serrate to entire. The leaves are reduced in size on the stems.
The flower heads bear 8-9 broad white rays, 3-lobed at the tips. The rays are 4-15 mm long. The central disk is yellow and globose. The involucre is 6-9 mm tall and is both glandular and hairy. Flowers from April into July.
White layia is a plant of dry, open places in the deserts and foothills, often in sandy soil.
White layia is found from southern British Columbia south along the eastern edge of the Cascades and Sierra Nevada into Baja California, east to Idaho and New Mexico.