Aspects of this topic are discussed in the following places at Britannica.
African marigold (T. erecta), French marigold (T. patula), and several other species are grown as garden ornamentals, although most species have strong-scented leaves. Members of the genus Tagetes have attractive yellow, orange, or red flowers that are solitary or clustered; leaves opposite each other on the stem that usually are finely cut; and bracts (leaflike structures)...
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