Isoetes echinospora Dur. × Isoetes occidentalis Hend. ?
Annotated by Ian Shackleford, 2 Feb 1997.

Oregon: Hood River County: Mount Hood region. Lost Lake. Elev. 3000 ft.
45.489391° N, 121.831552° W,
Datum: WGS 84. Uncertainty: 1777 meters. Coordinate Source: Digital Map.
In 6 feet of water. Submerged. Phenology: Spores.

J. William Thompson 11202, Jul 31, 1934
WTU, Accession: 185289, Barcode: WTU-V-004116