Malabar Chestnut
Adhatoda vasica
 
Adhatoda vasica, commonly known in English as Malabar nut, adulsa, adhatoda, vasa, or vasaka, અરડૂસી, अडूसा, వాసకం, is a medicinal plant native to Asia, widely used in Siddha Medicine, Ayurvedic, homeopathy and Unani systems of medicine. The plant's native range is the Indian subcontinent, Laos and Myanmar.
 
Seedling (nb: images are mature fruit trees).