Jacobaea vulgaris
Asteraceae
Tansy Ragwort
Stems erect, unbranched, solitary to few, alternate. Lower leaves 8–10 in., deeply pinnately divided; lower leaves falling by bloom time. Flower heads numerous, closely clustered on short stalks, atop stem. Flower head with 13 ray flowers, 1/3 in. central disk. Grows on roadsides, disturbed soils, at low and mid elevations. Originally from Eurasia. Invasive in pastures and fields, very toxic to cattle and horses.
- Rarity: Common
- Flowering Time: Early Summer, Mid Summer, Late Summer
- Flower Form: Senecio Tribe,Composite
- Life Cycle: Perennial
- Height: 2–4 feet
- Habitat: Coastal, Disturbed, Meadow, West-side Forest
- Found In: Mt. Rainier NP, N Cascades NP, Olympic NP
- Native: No
- Also Known As: Tansy Butterweed
- Latin Synonyms: Senecio jacobaea
