Galium serpenticum Dempster ssp. okanoganense Dempster & Ehrend. ssp. nov.
Annotated by L. T. Dempster, 1962. Remarks: Herbarium of the University of California. Det. L. T. Dempster & F. Ehrendorfer, 1962.

Washington: Lincoln County: At Keller Ferry 1 mile south of Columbia River. Elev. 1290 ft.
47.915774° N, 118.700793° W,
Datum: WGS 84. Uncertainty: 1000 meters. Coordinate Source: Digital Map.
Sandy slope. Much-branched and woody at base, forming clumps up to 8 dm. across. Pistillate. Phenology: Fruits. Isotype: Galium serpenticum Dempster ssp. okanoganense Dempster & Ehrend.. Published 1965. Brittonia 17(4): 329

H. T. Rogers 474, May 19, 1940
WTU, Accession: 83905, Barcode: WTU-V-001208