Wild Turnip, Field Mustard

(Brassica rapa) 3/31/12 D&M MD

http://plants.usda.gov/java/profile?symbol=BRRA&photoID=brra_1h.jpg

http://calphotos.berkeley.edu/cgi/img_query?where-taxon=Brassica+rapa&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&title_tag=Brassica+rapa