Sisymbrium loeselii L.
Family: Brassicaceae
small tumbleweed mustard, tall hedge-mustard
Sisymbrium loeselii image
Dan Tenaglia  
Etymology: Sisymbrium: Greek name for some plant of the mustard family
Plants: erect, annual, 20"-48" tall forb
Leaves: lower lyre-shaped to pinnately-divided and toothed
Flowers: yellow, 4-parted, 1/2" wide; inflorescence a loose cluster (raceme) of stalked flowers; blooms June-Aug.
Fruits: long, thin pod, erect, on thin stalks
Conservation Status: Introduced - adventive