Diplotaxis

1. Sepals (2.5–) 3–4 mm long; petals 5–7.5 mm long; stem ± soft at base (plant annual or perennial), with most or all leaves in a basal rosette; leaves usually lyrate, sinuate-dentate, or sparsely toothed.

D. muralis

1. Sepals (4–) 5–7.5 mm long; petals 6.5–9.5 (–10.5) mm long; stem hard and woody at base (perennial), leafy to the inflorescence, without a basal rosette; leaves all deeply pinnatifid.

D. tenuifolia

All species found in Diplotaxis

Diplotaxis muralisWALL ROCKET 
Diplotaxis tenuifoliaSAND ROCKET 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 26, 2017. http://michiganflora.net/genus.aspx?id=Diplotaxis.