Publication: Univ. Calif. Agric. Exp. Sta. Bull. 203: 27. 1909.
Origin: Introduced from southwestern Oregon and California
selected vouchers: WTU
Notes: Plants from one site in Yakima County that appear to be associated with homestead. Report of plants spreading from original planting. Also documented spreading downsteam from an old homestead and naturalizing along Rock Creek in Klickitat County.
References: (none)