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3a.3. Amaranthus Linnaeus (subg. Acnida) sect. Acanthochiton (Torrey) Mosyakin & K. R. Robertson, Ann. Bot. Fenn. 33: 277. 1996.
Acanthochiton Torrey in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers, 170. 1853
Plants annual, glabrous or glabrescent. Bracts of pistillate flowers leaflike, deltate or rhombic-deltate, very broad, margins crispate and denticulate. Pistillate flowers: tepals 5, outer tepals linear to narrowly lanceolate, inner tepals spatulate to fan-shaped. Utricles dehiscence circumscissile.
Species 1: sw North America.
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