Okay, Strange-Trippers, here's your big chance to contribute to our botanical knowledge. Are these Grindelia nana, which, according to Dorn's Vascular Plants of Montana, "mostly" have 12 to 25 rays, rarely more; or G. squarrosa, which "mostly" have 25 to 40 rays, rarely fewer. Start counting.
Guess I'll have to wait to see if the achenes have 1 or more very short knobs on the apical margin ("often" the case with G. nana), or "usually" lack them (so possibly G. squarrosa?). That ought to nail it down... Isn't it great to have an author who isn't afraid to take a stand??!