Myriophyllum ussuriense (Regel) Maxim.
Annotated by M.S. Alix, Dec 2016. Remarks: With R.W. Scribailo; FNA Project Purdue University Northwest

Washington: Wahkiakum County: Columbia River, Julia Butler Hansen National Wildlife Refuge, Steamboat slough, opposite Price Island.
T9N R6W S16
Datum: NAD 27. Uncertainty: 805 meters. Coordinate Source: TRS2LL.
Muddy shore. Forming sparse beds on mud flats along [omitted], within freshwater intertidal zone. Partial shade under Alnus rubra. With Crassula aquatica, Limosella aquatica, Eleocharis acicularis. [Noteworthy Collection; New to Washington; from Madrono, Vol. 47, No. 3, pp. 209-216, 2000. Copy of publication sheet in folder with specimen]. Phenology: Vegetative.

John A. Christy 8164, Jul 29, 1992
WTU, Accession: 345759, Barcode: WTU-V-029044