Sisymbrium species ?
Brassicaceae week : Plant from Spiti valley Himalayas. SMP3 09/11/2012: I had posted it earlier
The important comments from … was
It may be Sisymbrium species.or “I tentatively place it under Erysimum thomsoni “
Resending again for the Brassicaceae week for further thoughts. No more pictures esp leaves are available with me.
Leaves and habit would have helped but without these with such long fruits I can’t think of any thing else.
Sisymbrium heteromalum is another possibility.