Bidens pilosa
A widespread but oddly distibuted Bidens, found, among other places, in central New Mexico.
A pseudanthium in New Orleans near the French Quarter, 2 Jul 2007.
Pseudanthium with immature achenes, New Orleans, 2 Jul 2007.
Mature achenes in New Orleans, 2 Jul 2007.
Cauline leaves, New Orleans, 2 Jul 2007.