Publication: Enum. Hort. Berol. Alt. 2: 241. 1822.
Origin: Introduced from Europe
Herbarium search: CPNWH
Notes: First collected in WA in Yakima County in 2013, but that is possibly an intentional planting. 2021 collection from Lower Columbia River is clearly a naturalized occurrence.
Last updated 12/20/2021 by David Giblin.