Ambrosia psilostachya var. californica (Rydberg) S.F. Blake
Ambrosia psilostachya var. californica (Rydberg) S.F. Blake is a synonym sensu FNA Ed. Comm., 2006c of:
Ambrosia psilostachya de Candolle, an accepted species name sensu FNA Ed. Comm., 2006c.