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

Answer 1

1. University of Illinois Extension, "Sunflower," https://extension.illinois.edu/flowerscan/fom_02.cfm
2. Missouri Botanical Garden, "Helianthus annuus," http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c527
3. USDA National Resources Conservation Service, "Helianthus annuus L." https://plants.usda.gov/core/profile?symbol=HEAN
4. The Plant List, "Helianthus annuus," http://www.theplantlist.org/tpl1.1/record/gcc-80858
5. NC State Extension, "Sunflowers," https://plants.ces.ncsu.edu/plants/helianthus-annuus/