Looks like Scotch Broom according to your identification photos
Commentary
Scotch broom is very common in western Oregon. If you see Scotch broom east of the Cascades in central and eastern Oregon we would be very interested in reports state since it is a new invader weed in those areas. For more information about Scotch broom and its distribution in Oregon, please refer to the ODA web site at: http://oregon.gov/ODA/PLANT/WEEDS/profile_scotchbroom.shtml
Thank you for your submission: Tim Butler, ODA Noxious Weed Control Program.
Thank you for your submission: Tim Butler, ODA Noxious Weed Control Program.
Tim Butler
July 23, 2008, 7:41 a.m.