Amaranthus retroflexus var. powellii (S. Watson) B. Boivin

Amaranthus retroflexus var. powellii (S. Watson) B. Boivin is a synonym sensu FNA Ed. Comm., 2003a of:

Amaranthus powellii S. Watson subsp. powellii, an accepted subspecies name sensu Costea et al., 2001.