Tagetes nelsonii

Tagetes nelsonii is a Mexican species of marigold in the sunflower family. It is native to Guatemala and to the State of Chiapas in southern Mexico.
"Tagetes nelsonii" is a hairless annual herb from 50 cm (20 inches) to 2m (6 feet) tall. Leaves are pinnately compound with 3-7 leaflets. The plant produces numerous small flower heads in a flat-topped array, each containing 5-6 yellow ray florets surrounding 9-12 greenish-yellow disc florets. Also known as the citrus scented marigold, "'Tagetes nelsonii" is considered an edible flower and is often eaten raw. 
External links.
The National Gardening Association Plant Database