Cyperus lupulinus (Spreng.) Marcks × Cyperus schweinitzii Torr.
Annotated by Gordon C. Tucker, 19 Jul 2018. Remarks: Determination made by online specimen image

Washington: Asotin County: North shore Grande Ronde River, 4-0 Ranch. Elev. 1320 ft.
46.02958697° N, 117.3161564° W; T6N R44E S5 NE1/4 of NE1/4
Coordinate Source: Specimen Label.
Plants growing in partial shade amidst shrubs near edge of river. Plants growing in sand, boulders and cobbles. Aspect: 210 degrees. Slope: 2%. Associated species: Celtis reticulata, Salix exigua, Glycyrrhiza lepidota, Phalaris arundinacea, Poa compressa. Plants loosely caespitose with cormose bases, anthers 0.7mm, scales 3.3mm long, distal scale mucro 0.2mm, achenes 2.2 x 1.0mm, stigmas 2-3mm, styles 0.3mm, bracts ascending, spreading.

Kathryn A. Beck 201526, Jun 19, 2015
WTU, Accession: 414183, Barcode: WTU-V-031065