Understood, thin stems are always hard to photo. Well, here's another specimen of the same plant, I believe, if it might help?

You need to get much closer. We can't see the flowers or the foliage clearly.

Consider Sisymbrium altissimum, a tall species which has long, leafless stems. But, as floral said, mustard family plants are tough to ID. You'll need close, well-focused photos of basal and cauline leaves, plus flowers and fruits to confirm.

Hmm, Sisymbrium altissimum seems to have more stems, and less flowers? And it doesn't seem to have as long arms as these?

Ok, here's some closer shots:

The only other option that seems likely for your area is Brassica nigra, which can sometimes be modestly leafy at mid-plant levels. Both nigra and juncea have petiolate, cauline leaves like those in your photos. But the fruits of juncea are spreading, and those of nigra are appressed to the rachis. I think that I can make out (or imagine) appressed fruits in your photos.

Hmm, well Brassica nigra does look like a good candidate.. :)