What is "french marigold"

Marigold \Mar"i*gold\, n. [Mary + gold.] (Bot.) A name for several plants with golden yellow blossoms, especially the Calendula officinalis (see Calendula), and the cultivated species of Tagetes.

Note: There are several yellow-flowered plants of different genera bearing this name; as, the African marigold or French marigold of the genus Tagetes, of which several species and many varieties are found in gardens. They are mostly strong-smelling herbs from South America and Mexico: bur marigold, of the genus Bidens; corn marigold, of the genus Chrysanthemum ( Chrysanthemum segetum, a pest in the cornfields of Italy); fig marigold, of the genus Mesembryanthemum; marsh marigold, of the genus Caltha ( Caltha palustris), commonly known in America as the cowslip. See Marsh Marigold.

Marigold window. (Arch.) See Rose window, under Rose.