Apiaceae

Perideridia gairdneri

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
• Life Cycle: Perennial
• Height: 1--4 feet
• Habitat: Meadow, East-Side Forest, Subalpine, Coastal, Vernal Wet, West-Side Forest
• Found In: Siskiyous, East Gorge, Steens, Wallowas, Olympic Np, N Cascades Np
• Native: Yes