I've searched and searched, and I can't ID this wildflower. Any help greatly appreciated.
You could post at the "name that plant" forum; I'm sure someone there will know.
I'm a newbie, I didn't know it existed. Thanks for being nice :-)
It's a member of the Pea Family(Fabiacea) and appears to be the Showy Rattlebox, Crotalaria spectabilis (an introduced species). Without a photo of the leaves and lower stem, which are usually purplish in color. can't be sure. Check the photos on the link and see if that is it.
Here is a link that might be useful: Crotalaria spectabilis