2b. var. anthelminticum (L.) A. Gray

C. anthelminticum L.

Ambrina anthelmintica (L.) Spach

Dysphania anthelmintica (L.) Mosyakin & Clemants

Spikes bractless or with only a few small, leaflike bracts to 0.3–1.0 cm long. Calyx lobes rounded to somewhat flattened dorsally. August–November.

Introduced, uncommon and sporadic (native of tropical America; naturalized widely in the U.S. and Canada). Banks of rivers; also crop fields, fallow fields, gardens, roadsides, railroads, and open, disturbed areas.