Yellow variety of Hartweg's Iris flower

Hartweg's Iris (Iris hartwegii)

Hartweg's Iris and Western Blue Flag may appear to have been separated at birth, twins that can't even tell each other apart, but there's an exception: when you spot a non-purple version, like the one above, you can be sure it's Hartweg's.

This Photo:  Along Glacier Point Road, early June