Geraniaceae
Geranium robertianum

Herb Robert

Prostrate to upright, unpleasant-smelling. Stems hairy. Leaves triangular, lower leaves 1–2 in. wide, palmately divided into 3 leaflets that are pinnately lobed. Flower stalks carry 2 flowers with rounded petals 1/3–1/2 in. long, reddish or pink with white veins. Grows in moist open to shady sites up to 4000 ft. A noxious weed originally introduced as a garden plant; suppresses native species in west-side forests and is spreading rapidly. Three other small geraniums, G. carolinianum, G. dissectum, and G. bicknellii, also have deeply dissected leaves.

  • Rarity: Locally Common
  • Flowering Time: All Summer
  • Life Cycle: Annual, Biennial
  • Height: 4--20 inches
  • Habitat: West-Side Forest, Disturbed
  • Found In: Olympic NP, Mt. Rainier NP, N Cascades NP
  • Native: No