Bidens amplissima Greene

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KING COUNTY, WASHINGTON
U.S.A.
Bidens amplissima Greene Asteraceae
Annual, 7-10 bright yellow rays with
blades 6-11 mm long, anthers dark purple,
fruits 3-4 awned, warty, heads erect in
fruit, most leaves simple; common on
dried edges of large vernal pool, full sun,
seasonally wet soil, with Gnaphalium
uliginosum, Rorippa curvisiliqua, Lythrum
portula, Eleocharis palustris, E. obtusa,
W of Route 167 and M Street NW, Mill
Creek drainage, 3.4 air km E of Lake
Dolloff, Auburn, elev. 15 m, 47.3276° N,
122.2399° W
7 August 2018 Coll. Peter F. Zika 293 87
04382347