This one has me stumped.
It was taken in late June along a small creek at a little over 10,000 feet elevation in the Medicine Bow mountains of southern Wyoming.
You have caught this flower at quite an advanced stage. It is already making seeds, so isn't likely to match any of the pictures in a field guide.
My WAG based on the leaves as much as the flower is American Globeflower (Trollius laxus). But I'm not confident, and your response that it was solitary doesn't match its habit. It usually grows in a colony. Globeflower can be white or yellow.
I agree with David that it is likely Trollius laxus. The reason I asked whether it was the only one of its kind is because I thought it might be a mutated form (in which case you'd likely only find one or few plants). Read more about the phenomenon here: Double-Flowered Forms. I suspect it is the common mutation mentioned on that page, where some of the stamens have been replaced by petals.
Discussion
4 repliesIt was taken in late June along a small creek at a little over 10,000 feet elevation in the Medicine Bow mountains of southern Wyoming.
You have caught this flower at quite an advanced stage. It is already making seeds, so isn't likely to match any of the pictures in a field guide.
My WAG based on the leaves as much as the flower is American Globeflower (Trollius laxus). But I'm not confident, and your response that it was solitary doesn't match its habit. It usually grows in a colony. Globeflower can be white or yellow.