Creeping yellow cress (Rorippa sylvestris)

Creeping yellow cress (Rorippa sylvestris)
Images courtesy of Weed Science Society of America
Creeping yellow cress (Rorippa sylvestris)
EDRR Species?: 

Other common names
Yellow fieldcress

Perennial, flowers June to August. Grows up to 20 inches tall. Leaves are 2 to 4 inches long and pinnately divided into narrow, sharply toothed lobes. Flowers are yellow with four small petals.

A common pest of Netherlands ormamental bulb-production areas. This plant can reduce bulb crop value and marketability as a contaminate of nursery stock. It invades disturbed wetlands, and some evidence suggests that this species may be allelopathic.