I’m thinking this flower/weed is butterweed/cressleaf groundsel, or a closely related species.
We got out for a short loop, the Guru, me, crutches and The Boot. We decided not to push it and so didn’t go terribly far (no record setting today!), and somehow the Fitbit even deigned to give me a massive nine active minutes.
The bonus on our walk was that when I spotted this bumbler s/he was on a lower flower, and then flew up to this cluster, where I could actually reach down to photograph her/him.
And not drop a crutch.