Publication: Sp. Pl. 1: 314. 1753.
Origin: Introduced from Europe
Herbarium search: CPNWH
Notes: This species is known largely from a single location in Washington where it was possibly dumped as part of garden waste. There are no further collections of established populations. Additional specimens are needed to indicate that this is established in the flora.
Last updated 6/22/2020 by David Giblin.