Publication: Phytoneuron 2012-39: 1–60. 2012.
Origin: Introduced
Herbarium search: CPNWH
Notes: The occurrences in WA are localized in Yakima County near the confluence of Oak Creek and the Tieton River. It is likely that there were homesteads historically in the Oak Creek drainage and that the persistent populations represent naturalized escapes from prior cultivation.
References:
Last updated 10/17/2020 by David Giblin.