Any amateur (or professional) botanists out there who can help identify this plant?
It's growing along most of the levees along the SF Bay Trail in Sunnyvale/Mountain View, California (https://goo.gl/maps/vWMqPpSQKX92
I just assumed it was mustard, but when I got up close it looked different than the mustard I'm used to... which led me to realize there are a lot of different types of mustard. :)
I found this list of plants in Don Edwards National Wildlife Refuge (which this area is a part of).http://www.fws.gov/uploadedFiles/Plant_List(2).pdf
There are a lot of different mustards in the area:
Brassica nigra/black mustard
Brassica rapa/field mustard
Hirschfeldia incana/short podded mustard
Sinapis arvensis/charlock mustard
Sisymbrium orientale/oriental mustard
Google image search images for all of these looked very similar to me... anyone have an idea of which one the plants in my photos are from?