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The flowers in the Colorado mountains are spectacular. Here is a selection. I am grateful to Jane Hendrix and Marty Richardson for their help in identification. Jane Hendrix's web page has a quite complete collection of photos of flowers in Summit County. See <<http://www.picturetrail.com/gallery/view?p=6&uid=22322>>. My favorites in the list below are the last one in the Fairy Slippers section, the first Glacier Lily (by Mike Rogers), the Stemless Goldflower, the Kluane Poppy, and the exploding Prairie Smoke.
Some of these appear to me to be rare or unusual in the Colorado mountains, as they are seldom seen. In such a list I would place the following, in order of rarity as far as my observations go. This does not mean they are truly rare (though some are), but only that they are hard to find.
Rock clematis (seen only once: Joan Hutchinson spotted it)
Alpine dusty maiden (seen only once, Loveland Pass area)
Wood nymph (seen only once, Piney Lake area)
Kluane poppy (seen only twice)
Clustered lady slippers (seen only twice)
Alpine harebell (seen a few times)
Wooly actinella
Sugar bowl
White fairy slippers