Brassica integrifolia has a very limited distribution, it's almost impossible to find images of it.
http://www.discoverlife.org/mp...
Looking at Florida Broadleaf, which is also B. juncea, the leaves look much broader and more rounded but I would think it's a variety. The leaves on discoverlife look more pointed like yours, but still B. juncea and it really does look like it so yes I would put it under B. juncea.
Compare with other species.. Brassica kaber
http://www.colinherb.com/Cruci...
Brassica elongata.. impossible to find a decent photo of..
http://www.nadidem.net/flora/f...
Brassica rapa
http://commons.wikimedia.org/w...
Brassica gallicum now Erucastrum gallicum by the looks..
http://luirig.altervista.org/f...
http://www.flickr.com/photos/d...
Brassica fruticulosa
http://www.iewf.org/weedid/Bra...
Brassica campestris ..
http://www.agroatlas.ru/en/con...
Brassica napus ..
http://luirig.altervista.org/p...
Brassica nigra ..
http://www.pfaf.org/user/Plant...
Brassica oleracea ..
http://en.wikipedia.org/wiki/B...
Brassica tournefortii ..
http://www.pfaf.org/user/Plant...
Now we should all know more about Brassica.
