Tripleurospermum maritimum (L.) W.D.J. Koch var. salinum ?

Washington: King County: Under West Seattle Bridge, south end of Harbor Island, Duwamish River, west end of bridge, Riverside, Seattle. Elev. 16 ft.
47° 34.4' N, 122° 21.1' W; T24N R3E S13
Disturbed ground, partial shade, with Hypericum perforatum, Lolium perenne. No strong odor; white ligules, elongate oil glands; no chaff; adventive. Phenology: Flowers.

Peter F. Zika 19854, Jun 15, 2004
WTU, Accession: 368939, Barcode: WTU-V-042796