Rheum australe, synonym Rheum emodi, is a flowering plant in the family Polygonaceae.[1] It is commonly known as Himalayan rhubarb,[2][3] Indian rhubarb[2] and Red-veined pie plant.[2] It is a medicinal herb used in the Indian Unani system of medicine, and formerly in the European system of medicine where it was traded as Indian rhubarb.[4] The plant is found in the sub-alpine and alpine Himalayas at an altitude of 4000 m.[5]