Silene douglasii is a tufted perennial herb growing from a branching caudex and taproot, its stems decumbent to erect and up to 70 centimeters long. The stem is coated in curly or feltlike gray-white hairs. The lance-shaped leaves are up to 6 centimeters long on the lower stem and are smaller farther up.
Each flower is encapsulated in a cylindrical inflated calyx of sepals lined with ten green or purple-red veins. It is open at the tip, revealing five white, pink or purplish petals, each with two wide lobes at the tip.
There are three varieties of this species.
- Silene douglasii var. douglasii 
- Silene douglasii var. oraria — Seabluff catchfly, rare and endemic to the Oregon coastline.
- Silene douglasii var. rupinae 
- Jepson Manual Treatment of Silene douglasii
- USDA Plants Profile for Silene douglasii (Douglas catchfly)
- CalFlora Database: Silene douglasii (Douglas Catchfly, Douglas' campion, Douglas's catchfly, seabluff catchfly)
- Flora of North America
- Washington Burke Museum
- UC Photos gallery: Silene douglasii
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