The photo above shows a close-up of the flower of himalayan blackberry as seen at Catherine Creek in the central Columbia River Gorge.........June 3, 2006.
It may be found in the Columbia River Gorge between the elevations of 100'-3000' from the western approaches to the gorge (where it is very common) to the eastern end of the gorge where it is seen rarely.
In the Columbia River Gorge, it is most common at lower altitudes (below 3000') but may be found at least as far east as Biggs Junction where there is water (typically atop a spring or along a stream) where birds have spread the seeds with their droppings and there is enough moisture for the seeds to germinate.
The photo above shows a close-up sideview of the flower of himalayan blackberry as seen at Catherine Creek........June 3, 2006. Note the straight prickles on the stem and the dense covering of fuzzy hairs on the sepals.
-- --Close-up views of himalayan blackberry as seen along the Old Highway at Catherine Creek, Columbia River Gorge..........June 3, 2009.