Descurainia pinnata
Family: Brassicaceae
green tansy mustard, pinnate tansy mustard, western tansy mustard
Descurainia pinnata image
PNW Weed Management Handbook  
Etymology: Descurainia: in honor of Francois Descourain (1658-1740), a French pharmacist and botanist
Plants: erect, annual/biennial, 8"-28" tall forb
Leaves: stem leaves 1-3 times pinnately-divided into fine, feathery leaflets
Flowers: yellow, 4-parted, 1/8" wide; inflorescence up to 12" long in a loose cluster of stalked flowers; blooms May-July
Fruits: club-shaped pod, not drooping; fruit drawing seeds in 2 rows
Habitat: full to partial sun; dry; disturbed areas
Conservation Status: Native