Published online by Cambridge University Press: 20 January 2017
Coxcatlán Cave has yielded the earliest records of two domesticated species still grown as minor grain crops in Mexico. Amaranthus cruentus, previously unknown archaeologically, is tentatively identified from a level dated at about 4000 B.C. and positively identified from six levels dated between about 2500 B.C. and the time of the Conquest. Amaranthus hypochondriacus was found at two levels dated about A.D. 500. There is no evidence that either species was domesticated locally.