Bidens bigelovii
A white-rayed (or discoid) Bidens in which the outer achenes are short, broad, and flattened.
A pseudanthium in Fillmore Canyon, west side of the Organ Mountains, 21 Sep 2008.
A pseudanthium along the Pine Tree Trail at Aguirre Springs on the east side of the Organ Mts., 24 Sep 2005.
Immature achenes at Aguirre Springs, 24 Sep 2005.