Euphorbia serpyllifolia Pers. ssp. hirtella (Engelm. ex S. Watson) Oudejans
[= Euphorbia serpillifolia ssp. hirtula]

Washington: Benton County: N shoreline of Lake Umatilla, near junction of Engineers Road and I-82, east of Plymouth Park. Elev. 80 m.
45.934403° N, 119.330524° W
Datum: WGS 84. Coordinate Source: Specimen Label.
Occasional in open sandy beach gravel, full sun, over basalt, with Coreopsis atkinsoniana, Amorpha fruticosa, Euthamia occidentalis. Prostrate annual, hairs of capsule and foliage spreading, seed white, wrinkled.¶USAC Columbia River Plant Survey. Phenology: Flowers and Fruits.

Peter W. Dunwiddie PWD 18-435, Aug 11, 2018
With Peter F. Zika
WTU, Accession: 418883, Barcode: WTU-V-041961