ru·​el·​lia | \ rüˈelēə\

Definition of ruellia

1 capitalized : a very large genus of chiefly tropical American herbs and shrubs (family Acanthaceae) that have showy solitary or paniculate flowers with the simple or 2-lobed style recurved at the apex and the ovary 2-celled
2 plural -s : any plant or flower of the genus Ruellia

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First Known Use of ruellia

1751, in the meaning defined above

History and Etymology for ruellia

New Latin, from Jean Ruel (latinized Ruellius) †1539 French physician and botanist + New Latin -ia

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The first known use of ruellia was in 1751

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to take the place or position of

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