The present document is a companion document to Dir94-08. It is intended to provide background information on the biology of Helianthus annuus L., its centre of origin, its related species, the potential for gene introgression from H. annuus into relatives, and details of the life forms with which it may interact. Attachments:  Biology_of_Helianthus_annuus_Ca

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The sunflower belongs to the genus Helianthus in the Composite family (Asterales order), which includes species with very diverse morphologies (herbs, shrubs, lianas, etc.). The genus Helianthus belongs to the Heliantheae tribe. This includes approximately 50 species originating in North and Central America. Attachments:  Biology_of_Sunflower

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