Perideridia montana
Apiaceae
Gairdner's Yampah
Erect, slender plant smelling like caraway. Basal leaves with blade divided 1–2 times pinnately into 3–5 pairs of 1–12 in. long, narrow segments; stem leaves less divided. Leaves wither at flowering. Umbels have uneven, spreading to ascending stalks, each bearing few to many clusters of 15–40 white to pinkish flowers. Grows in spring-wet meadows, near streams or coastal flats to alpine meadows. Subsp. borealis has 5–7 veins in the flower petals; grows from coast to alpine. Subsp. gairdneri has a single vein in the flower petal; grows only at low elevations. Similar P. oregana is smaller, with broader and better-developed bractlets.
- Rarity: Common
- Flowering Time: Late Summer
- Flower Form: 5 tiny petals; fls. in umbel (parsley famly)
- Life Cycle: Perennial
- Height: 1–4 feet
- Habitat: Coastal, East-side Forest, Meadow, Subalpine, Vernal Wet, West-side Forest
- Found In: East Gorge, N Cascades NP, Olympic NP, Siskiyous, Steens, Wallowas
- Native: Yes
- Latin Synonyms: Perideridia gairdneri
