It looks a lot like Arugula, AKA Rocket or Roquette (Eruca sativa); however I'm no expert. I suspect that there are many similar species in this family.
Hello vitog, Thank you for your interest. This plant is definitely not Eruca sativa. Eruca has flowers with petals well spaced from one another. The petals are generally white but can also be lilac/pinkish with dark veins or streaks, but even this taxa I find confusing as the flowers are similar to Raphanus raphinistrum! The plant also tends to be bush like. I have uploaded three photographs of Eruca sativa. Getting back to the Brassicaceae taxa that I am unable to identify two or three years have passed since I took the photographs, and since I have not been able identify it.
I think the 1st one is a Diplotaxis erucoides and the 2nd (pink) one is a Raphanus sativus (not an Eruca).
