“identify the point of domestication.”
Maybe there is no single point of origin.
“Genetic Analysis of Sunflower Domestication-... Moreover, two recent molecular studies suggest the possibility of multiple origins (S. TANG and S. J. KNAPP, unpublished data; A. V. HARTER and L. H. RIESEBERG, unpublished data).”
I wonder why they have the idea the Spanish introduced it.