Mustard, Field
 

Brassica campestris
A 1-3' plant with a stout, smooth stem with a bloom. The lower leaves are pinnately lobed, the lance-shaped stem leaves are clasping with prominent, rounded "ears". The pale yellow 4-petaled 1/2" flowers are on long stalks in terminal and leaf axil clusters. The slender 1-2" seedpods have a prominent beak. Blooms April-October in waste places, roadsides.

Its slender root differentiates this species from the Wild turnip (B. rapa).