Aspects of this topic are discussed in the following places at Britannica.
...weedy herbs found mostly in the tropics of both hemispheres; and some annuals and perennials, known as three-seeded mercury, are native in the southern United States. Another ornamental species, the chenille plant, or red hot cattail (A. hispida), reaches a height of 3 m and is grown for its long, taillike, pendent flower spikes, rust red in colour. It is native to tropical eastern...
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