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It is an annual plant growing to 1 m tall, with slender, linear leaves 2–7 cm long and 2–6 mm broad. The flowers are pink to pale purple, with four broad petals 1.5–6 cm long. The fruit is a dry capsule, which splits open when mature to release the numerous seeds.
SF Botanical garden. It is a flowering plant native to western North America, found in coastal hills and mountains from British Columbia south to the San Francisco Bay Area.