Wolffia columbiana Karst.
Annotated by David Giblin, 25 Oct 2018. Sources: Flora PNW, 2nd.

Washington: Skamania County: Icehouse Lake and adjacent old beaver ponds on north end. North side of Highway 14 at intersection with Bridge of the Gods. Elev. 49 m.
45.66138° N, 121.90633° W
Datum: WGS 84. Uncertainty: 200 meters. Coordinate Source: GPS.
Eutrophic ponds with shoreline of main pond dominated by Iris pseudacorus, Typha latifolia, Leersia oryzoides and Juncus effusus; beaver ponds less disturbed with Bidens cernua common along shoreline with Equisetum telmateia. Common in beaver ponds and forming thing film on water surface.[Mixed collection with 420617 and 420619; filed under Azolla filiculoides]. Phenology: Vegetative.

David Giblin 6457, Sep 13, 2018
WTU, Accession: 420618, Barcode: WTU-V-048433