Sisymbrium officinale (L.) Scop.
Family: Brassicaceae
Sisymbrium officinale image
PNW Weed Management Handbook  
Etymology: Sisymbrium: Greek name for some plant of the mustard family
Plants: erect, annual, 12"-32" tall forb
Leaves: lower leaves stalked, deeply pinnately-divided with the end segment rounded and toothed; upper leaves stalkless, often un-divided, smaller
Flowers: light yellow, 4-parted, 1/3" wide; inflorescence a stiff cluster (raceme) of stalked flowers; blooms May-Sept.
Fruits: long, thin pod held near the stem
Habitat: disturbed sites
Conservation Status: Introduced - naturalized