Brassica napus subsp. napus ?
SK341JAN24-2017:ID : 6 posts by 2 authors. Attachments (5)
Location: Bajrabarahi,Nepal 
Altitude: 4700 ft.
Date: 31 December 2016

Wild or cultivated?
I have no idea. Found single plant on the roadside near people habitat ! 
Some edible saag/subji ?

Pl. see comparative images at Brassicaceae
Pl. check comparative images at Brassica
Also check images at Brassica napus L. subsp. napus
Requested to please ID this yellow Brassicaceae member seen at Mana near Badrinath, Uttarakhand in Aug 2018.
I am not sure but it could be cultivated, it was seen in the village.

Pl. try at 

one would need the leaves to be definitively diagnose the mustard variety b. rapa vs b. napus etc. did you take any pictures of the leave?
Pl. check comparative images as suggested by ... at 

Details of lower leaves etc. are required.

i thought we had decided it needed lower leaves. ... do you have them?

If she posts the original high resolution image, these can be deciphered. 
I have cropped the pics for lower leaves, however, I do not think they would help much. I do not have any more pics.
Prashant ji seems to have captured a similar plant at the same location, but he has much more detailed pics, which were identified as B. napus subsp. napus by ...
Next time, try to smell the leaves and you can make out many things :).
Nice to see that you went to Mana Village. Such a wonderful place to be. I happen to be there twice till the last tea stall !!