Probably hundreds of males every few feet feeding and resting on the thistles
Herbarium Collection Made
Associated Bombus crotchii observations (same area, along 50 yards, at most, of trail)
https://www.inaturalist.org/observations/172586009
https://www.inaturalist.org/observations/172779726
Associated floral resource observation is Sierra Snapdragon (Sairocarpus multiflorus), endemic to CA, many of these in the area.
Thought poor dude was on his last legs, but he flew away right after the pic was taken.
Milkweeds a-buzz with bees everywhere!