The sunflower (Helianthus annuus) in Mexico: further evidence for a North American domestication

Abstract

I have concluded that my initial verification of a specimen recovered from the San Andrés archaeological site in Mexico as domesticated sunflower was incorrect. The specimen in question is most likely the seed of a bottle gourd. As yet there is no compelling evidence that the sunflower was grown as a food crop in Mexico prior to European contact. In addition, the complete absence of any early historical record for the sunflower in Mexico argues against its presence in pre-Columbian times. Although no dates or boundaries can be set, the wild sunflower may have grown in northernmost Mexico in early times. A southward range expansion for the species is probably very recent, perhaps in the last few hundred years with the development of a modern road system. The widely used common names of the sunflower in Mexico are in Spanish or with Spanish words in them, which suggests that the sunflower is a post-contact arrival.