Marigold :

Marigold, common name for several related plants of the daisy family that typically have orange to yellow flowers. True marigolds are also known as calendulas and include the pot marigolds. Another genus of marigolds is native to tropical and subtropical regions of the Western hemisphere. The African marigold, native to Mexico, is one member of the genus. It is an annualherb growing up to about 1 m (3 ft) tall and producing large, globular, golden-yellow or orange flower heads. African marigolds have been bred in both single- and double-flowered varieties. French marigold is a smaller Mexican annual, growing about 45 cm (18 in) tall and producing small yellow and red flower heads. The marsh marigold belongs to the buttercup family.

Scientific classification: Marigolds belong to the family Asteraceae (or Compositae). True marigolds are classified in the genus Calendula. The African marigold is classified as Tagetes erecta and the French marigold as Tagetes patula. The marsh marigold belongs to the family Ranunculaceae and is classified as Caltha palustris.