Publication: Botany (Fortieth Parallel). 366. 1871.
selected vouchers: Not at WTU; WS?
Notes: FNA lists for WA but its occurrence needs to be documented. KZ, 2004, reports a voucher at WS from Walla Walla, County. Identification needs to be verified.
SPNW does not show this species occurring anywhere near Washington. Until a voucher is located confirming the Washington occurrence, this species is considered excluded.