For those of you beginning to tire of winter, here is a flashback to last summer in the Sierra Nevada mountains. Flowers seem like they ought to be sensitive, but they grow on bare rock and in tiny crevices, flaunting their hardiness with their petals.
Mountain Pride
Prettyface
Mountain Spirea
Leichtlin’s (?) Mariposa Lily
Leichtlin’s (?) Mariposa Lily (with tiny beetle)
Tough Little Birds 
I’ve always been astounded what plants can apparently grow out of rocks. Great collection.
I really like little mountain flowers, they can be so delicate.