Here is a good site for most of the flowers you see in the High Sierras.
The pink is Mountain Pride, a pink penstemon.
Here is the arnica site to look at
There are several types of Arnica. I was told that what we saw was
heart leaf arnica, but I can't find the exact site for that.
One of your photos was phlox.
The yellow one with the long leaves is a Wooly Mules Ear. A good description is found here:
I thought they were Lambs Ears since they were shorter and more gray in
color. I was told a few years ago that they were anyway. However, after
searching, it looks more like the mules ears. Here is the site for WoolyLambs Ears.
This is a great site for wildflowers:
last updated 8 May 2012