Bidens laevis (L.) B.S.P.
Remarks: Determination given with question mark.

British Columbia: Freshwater intertidal swamp of Fraser River, Richmond, Greater Vancouver area. Elev. 3 ft.
49° 6.1' N, 123° 5.8' W
Driftwood lagoon pool, full sun, inundated daily, with Sagittaria, Alisma, Scirpus, Leersia. About 200 plants, all flowers erect; (5) 6-8 rays, these average 15-22 millimeters long. [Sample A]. Phenology: Flowers.

Frank Lomer s.n., Aug 5, 2007
WTU, Accession: 371985