Key points are not available for this paper at this time.
Carbonized seeds of domesticated sunflower ( Helianthus annuus var. macrocarpus Ckll.) recovered from the Hayes site in middle Tennessee yielded an accelerator date of 4265 ± 60 B.P. This is the earliest date for domesticated sunflower, extending the known age of this eastern North American domesticate by 1,400 years.
Gary D. Crites (Fri,) studied this question.