Colocynth (Citrullus colocynthis), Bitter Apple Description of Plant Colocynth (Indravaruni, Bitter Apple) is a great herbal plant with many useful properties. It is also known as Citrullus colocynthis. Indravaruni belongs to the family of gourds and a relative of watermelon. It is the native of Africa and India. It is highly drought tolerant, hard, herbaceous vine. This plant can grow annual or perennial. Their stems are irregular and rough to great extent. Leaves are very rough, 5 to 10 cm