Heteranthera dubia (Jacq.) MacMill.
Annotated by Ben Legler, Jul 2019.

Idaho: Boundary County: West side of Farm to Market Road 0.9 air km NNW of Copeland. Elev. 510 m.
48.911588° N, 116.392789° W
Datum: WGS 84. Uncertainty: 4 meters. Coordinate Source: GPS.
Narrow pond formed by old river oxbow, surface covered in Spirodella polyrhiza and Wolffia borealis, rimmed by shrubs, Phalaris arundinacea, and Typha latifolia. Leaves linear, 2-3 mm wide, midvein no more distinct than lateral veins, cross-veins prominent, leaf base sheathing for 5-6 mm, sheath closed part of length, with lanceolate ligule 10-14 mm; stems and leaves red-dotted; no flowers or fruits seen; plants submerged in ca 1 meter deep water; common. Photographed. Phenology: Vegetative.

Ben Legler 15034, Jul 23, 2019
ID, Accession: 182245, Barcode: ID187799