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Helianthus annuus L. Asteraceae Sun flower Distribution: Peru to Mexico. The seeds are a source of linoleic acid, a polyunsaturated fat which as part of one's diet is given to reduce coronary artery and cerebrovascular disease, but recently a study has found an increased death rate (BMJ2013. Dr Henry Oakeley. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.