Amaranthus sect. Acnida
Ann. Bot. Fenn. 33: 277. 1996.
Plants annual, glabrous. Bracts not enfolding flower, not leaflike, narrowly elliptic to subulate-linear, margins entire, plane (or in some species indistinctly undulate). Pistillate flowers: tepals absent or 1–2, reduced-linear or linear-lanceolate. Utricles usually indehiscent (dehiscent in some forms of A. tuberculatus).
North America, Mexico, West Indies, South America.
Species 4 (4 in the flora).