Publication: Vasc. Pl. Pacif. N. W. [C.L. Hitchcock & al.] 4: 286. 1959.
Origin: Introduced from eastern North America
Herbarium search: CPNWH
Notes: The single specimen collected in WA under this name was misidentified - it is P. philadelphica.
Last updated 2/12/2024 by David Giblin.