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creeping yellow cress (Rorippa sylvestris)
ODA rating: B
Oregon creeping yellow cress distribution
Other common names
yellow fieldcress
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Creeping yellow cress flower  
Creeping yellow cress flower  
Images courtesy of Weed Science Society of America
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Perennial; flowers June to August. Grows up to 20 in tall. Leaves 2 to 4 in long and pinnately divided into narrow, sharply toothed lobes. Flowers yellow with four small petals.
A common pest of Netherland 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.
Distribution in Oregon
Can be found as pest in some agriculture crops in Western Oregon.

Biological controls
No approved biological control agents are available.