Phacelia plant flower. Glacier National Park, Montana, USA.

A fly and bee explore a Phacelia flower stalk covered with protruding stamens and pistils. Contact with some species of this genus such as Phacelia crenulata can cause a very unpleasant rash similar to that from poison oak and poison ivy in sensitive individuals, due to the chemical geranylhydroquinone. Photo is from the Dawson Pass Trail, Glacier National Park, Montana, USA.