How about this one?

[Tom]

This popped up in my Chersina pen. Anyone recognize it?

 

[Yvonne G]

wild raddish???

 

[RosemaryDW]

I’d also vote wild radish; plenty popping up after our rains. Are any of the petals a bit pink, as well as white? They can be either/both.

Same family as mustard and all the other brassicas, even if it doesn’t turn out to be radish, so safe.

 

[ZEROPILOT]

So, if it's wild radish, would it have a radish root ball?
That would seem to confirm it.
I remember my seed mix had wild radish in it and after I dug it up, I found some large, split open radishes.

 

[RosemaryDW]

Wild radish doesn’t have a root ball, so to speak. It does have a broader root than the stem. Like this.



More like one of your fancy French radishes. . I suppose the root would get more obvious over time? Wild radish usually doesn’t live more than a season because it doesn’t get watered.