Ruellia tuberosa, also known as minnieroot, fever root, snapdragon root and sheep potato (Thai: ต้อยติ่ง), is a species of flowering plant in the family Acanthaceae. Its native range is in Central America but it has become naturalized in Africa (Tanzania in particular), South and Southeast Asia.

Some butterfly species, like the lemon pansy (Junonia lemonias) and the mangrove buckeye (Junonia genoveva), feed on the leaves of Ruellia tuberosa.

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