This is a low-growing aster that forms small mat-like clumps. Appears to be very drought-tolerant. Foliage is only about 4 inches tall, flowers are on stalks up to 1 ft. It's flowering right now (end of March).
SOLVED: yellow aster mat-forming perenial
Maybe Coreopsis lanceolata.
It is even a weed here in Volcanoes National Park.
I agree with sladeofsky. Hymenoxys http://davesgarden.com/guides/pf/adv_search.php?searcher[common]=&searcher[family]=&searcher[genus]=Hymenoxis&searcher[species]=&searcher[cultivar]=&searcher[hybridizer]=&searcher[grex]=&search_prefs[blank_cultivar]=&search_prefs[sort_by]=rating&images_prefs=both&Search=Search&searcher[genus]=Hymenoxys
Not sure which one. Petals look right too.
That Humenoxys (now Tetraneuris, apparently) looks right to me. Thanks!