Sinapis arvensis L.
Family: Brassicaceae
California rape, charlock mustard
Sinapis arvensis image
Merel R. Black  
Etymology: Sinapis: Greek, said to come from the Celtic for "turnip"
Plants: annual, 4"-32" tall forb, usually with some rough hairs
Leaves: oblong, lower leaves coarsely toothed to lobed
Flowers: yellow, 4-parted, 1/2" wide; inflorescence a cluster (raceme) of stalked flowers; blooms May-July
Fruits: long, thin, flat, erect, 4 -sided pods, the pointed tip often half as long as the body
Habitat: disturbed areas
Hazardous: Careful, this plant is hazardous!
Conservation Status: Introduced - naturalized