Publication: Sp. Pl. 1: 22. 1753.
Origin: Introduced from eastern North America
Herbarium search: CPNWH
Notes: Sparingly escaped in WA - one record at WTU dating back to 1949. Does not appear to be an established part of the flora, so is currently considered to be excluded.
Last updated 10/30/2020 by David Giblin.