Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Distrubed areas such as roadsides, fields, and waste lots.
Origin: Introduced from Eurasia
Growth Duration: Annual
Conservation Status: Not of concern
Tall annual herb; stems 0.4-1.5 meters tall; usually branching; hairy near base.
Alternate; lower leaves pinnately lobed; upper leaves simple.
In bright yellow clusters (racemes) at stem tips; with 4 petals.
Narrow pods (siliques) to 2.5 cm long.
Distinguished from other Brassica spp. mostly by fruit characteristics; see technical keys.