Mariposa Lily

I am not sure which species of Mariposa Lily this is, but I am pretty confident that it is a Mariposa. This was the first time I ever remember seeing one. I saw a number of them in a grassy field along the highway where I had to wait on account of road construction.

Next: Brownlee Dam
Journal: 30 May 2000: From Nampa to Pullman Via Hell's Canyon