One of the mysteries of the English language finally explained.
Any of numerous flowering plants comprising the genus Ruellia (family Acanthaceae), chiefly native to tropical regions of Asia and the Americas but commonly cultivated elsewhere as ornamentals for their showy funnel-shaped flowers. Also (in form Ruellia): the genus itself.
Mid 18th century. From scientific Latin Ruellia from the name of Jean Ruel, French botanist + scientific Latin -ia.
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