Give me specific sources of citied for this idea "Sunflowers (Helianthus annuus) are annual plants belonging to the Asteraceae family, known for their vibrant yellow flowers and oil-rich seeds."

Answer 1

1. "Sunflowers." Missouri Botanical Garden. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=296706&isprofile=1&basic=sunflower Accessed on 24 October 2021.

2. "Helianthus annuus." The Plant List. http://www.theplantlist.org/tpl1.1/record/gcc-101780 Accessed on 24 October 2021.

3. "Sunflower." Encyclopaedia Britannica. https://www.britannica.com/plant/sunflower Accessed on 24 October 2021.