Epilobium ensiflorum
Onagraceae
Dense-Flowered Willowherb
Stem erect, sometimes branched in inflorescence. Leaves opposite, narrow, lance-shaped, 1/2–2 in. long; upper leaves hairy, sessile, becoming shorter, wider, alternate. Inflorescence with many leaves and spikes of many flowers, sometimes sticky with glands. Flower petals pink to rose-purple, deeply lobed, less than 1/2 in. long. Seed has no dandelion like fluff. Grows at all elevations in dry soils that were moist in spring. Similar E. torreyi, brook spike-primrose, with sharply pointed seedpods and also without dandelion fluff attached to the seed, grows in the Columbia River Gorge and on Steens Mountain.
- Rarity: Locally Common
- Flowering Time: Mid Summer
- Flower Form: Petals 4
- Life Cycle: Annual
- Height: 6–40 inches
- Habitat: Disturbed, Meadow, Moist Riverbanks, Shrub-Steppe, Vernal Wet
- Found In: Mt. Rainier NP, Siskiyous, Steens, Wallowas, West Gorge
- Native: Yes
- Also Known As: Dense-Flowered Boisduvalia
- Latin Synonyms: Boisduvalia densiflora
