Diplotaxis muralis (L.) DC.
Family: Brassicaceae
sand rocket,  more...
[Sisymbrium murale L.]
Diplotaxis muralis image
Gary Fewless  
Etymology: Diplotaxis: from Greek diplous, "double," and taxis, "row," because of the double row of seeds in the seed pod
Plants: sprawling annual/perennial forb
Leaves: coarsely toothed
Flowers: yellow, 4-parted
Fruits: long, thin pod
Conservation Status: Introduced - adventive