Publication: Index Seminum (Louvain). 1839: unpaged. 1839.
Origin: Introduced from eastern North America
Herbarium search: CPNWH
Notes: This species is known in Washington from a single collection by Suksdorf in 1916. Until additional specimens are collected indicating that it is established in the flora, this species is considered excluded.
Last updated 10/13/2020 by David Giblin.