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The Origin and Evolutionary Relationships of `Huauzontle' (Chenopodium nuttalliae Safford), Domesticated Chenopod of Mexico

Hugh D. Wilson and Charles B. Heiser, Jr.
American Journal of Botany
Vol. 66, No. 2 (Feb., 1979), pp. 198-206
Stable URL: http://www.jstor.org/stable/2442525
Page Count: 9
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The Origin and Evolutionary Relationships of `Huauzontle' (Chenopodium nuttalliae Safford), Domesticated Chenopod of Mexico
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Abstract

A New World assemblage of tetraploid Chenopodium species (section Chenopodium, subsection Cellulata) includes two domesticates, C. quinoa of Andean South America and C. nuttalliae of Mexico Both have been combined into a single species and the Mexican form has been considered as a possible derivative of C. quinoa. The domesticates and related, sympatric weed forms, C berlandieri of North America and C. hircinum of the Andes, were examined for variation in morphological and biochemical characteristics and also were included in a program of artificial hybridization. Results indicate that the domesticated forms are more closely related to their sympatric weeds than to each other. The Mexican cultigen is placed as a subspecies of C berlandieri, the taxon from which it most likely evolved under human selection in North America Possible origins for the Andean weed-crop complex are considered. Southward migration of a North American tetraploid appears to be more likely than independent allotetraploidy in South America. Of the North American tetraploids examined, C berlandieri var. zschackei of the western U.S. shows closest affinities to the Andean complex

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