White-flowered Hawkweed, White Hawkweed
Hieracium albiflorum
Synonyms: Chlorocrepis albiflora, Hieracium helleri, Hieracium occidentale, Hieracium siskiyouense
A close-up of the inflorescence of white-flowered hawkweed as seen along the Steins Pillar Trail, Ochoco National Forest........June 26, 2017.
The photo above shows the inflorescence of
white-flowered hawkweed as photographed at about 4100' atop the ridge that divides
the Cougar and Dairy Creek drainages at the southeast corner of Mt. Adams........July
10, 2005.
- 
The photo above shows a close-up of the flower
head of white-flowered hawkweed as photographed at about 4100' atop the ridge
that divides the Cougar and Dairy Creek drainages at the southeast corner of
Mt. Adams.........July 10, 2005. This is the only white-flowered hawkweed
species in the Pacific Northwest. Note the thin, black bristles on the involucral
bracts. Note also the squared-off, fringed tips
to the rays.
- 
Additional photos
of white-flowered hawkweed as photographed along the valley trail about three-quarters of a mile northwest of the Painted Rocks Trailhead, Little Spokane River Natural Area..........July 5, 2011.
Paul Slichter