Amaranthus subg. Amaranthus
Plants annual, usually monoecious (in some species, staminate flowers rare). Stems usually erect, not fleshy. Inflorescences terminal and axillary, ± long, cylindric spikes or panicles; axillary inflorescences similar to terminal ones, but shorter. Pistillate flowers: tepals usually (3–)5. Utricles transversely dehiscent (except A. bouchonii Thellung and some forms of A. spinosus and A. obcordatus).
North America, Central America, South America, one species perhaps native to Europe, introduced into other regions.
Species ca. 20 (14 in the flora).