Bacopa rotundifolia (Michx.) Wettst.
Annotated by Peter W. Dunwiddie, 15 Aug 2018. Remarks: USAC Columbia River Plant Survey

Washington: Benton: 0.6 air km N of Telegraph Island in Lake Umatilla, Umatilla National Wildlife Refuge, Ridge Unit. Elev. 80 m
45.92067° N, 119.63089° W,
Datum: WGS84.
In shallow water to 15 cm deep and on muddy shoreline, full sun or partial shade, over basalt; small cove. Eleocharis obtusa, Eleocharis acicularis, Ludwigia palustris, Schoenoplectus acutus, Lythrum salicaria, Zannichellia palustris Locally common; prostrate, white flowers. Https://oregonflora.org/collections/individual/index.php?occid=4194796. Phenology: flowering.

Peter W. Dunwiddie PWD 18-502, 15 August 2018
With Peter F. Zika
OSC, Catalog: OSC-V-260089