Ruellia tuberosa (Common name: Waterkanon, Watrakanu, Minnie Root, Iron root) - Acanthaceae,

Ruellia tuberosa (Common name: Waterkanon, Watrakanu, Minnie Root, Iron root) - Acanthaceae, a West Indian herb with curiously shaped blue flowers and fusiform tuberous roots.

 The big bisexual flowers are violet. In folk medicine and Ayurveda it has been used as a diuretic, anti-diabetic, antipyretic, analgesic, antihypertensive, gastroprotective, and to treat gonorrhea. 

Reference 

Surendra Parihar

Ex.Professor and Head.

Deptt. of Seed , Science and Technology. IARI,

Pusa, 

New Delhi 110012