Cardamine occulta Hornem.
Annotated by Ben Legler, Apr 2016.

Washington: King County: Near west end of a triangle formed by intersections of NE Pacific Street, NE Pacific Place, and Montlake Boulevard NE, on southeast edge of University of Washington campus, Seattle. Elev. 7 m.
47.650333° N, 122.306566° W
Datum: WGS 84. Uncertainty: 4 meters. Coordinate Source: GPS.
Recently installed landscaping, planted with Berberis aquifolium, Fragaria ananassa, and Ajuga reptans; with abundant weeds including Cerastium glomeratum, Euphorbia peplus, and Poa annua; full sun; rich moist soil. Petals white, 5 x 1.5-2 mm; stamens 6; siliques slender, ascending at ca 20-45 degree angle to rachis; taprooted annual, lacking a central stem, with numerous prostrate to ascending, basal branches, these again much-branched, forming dense tangled mounds; basal leaves absent; very abundant weed in landscaping over an area of several acres. Photographed. Phenology: Flowers & Fruits.

Ben Legler 14023, Apr 7, 2016
WTU, Barcode: WTU-V-023532