Punarnava consists of the fresh and dried herb of Boerhaavia diffussa, belonging to the family Nyctaginaceae. It is also known as rakta punarnava and hog weed.
It is cultivated in India and Sri Lanka. It is found in Himalayan regions at an altitude of 2000-2500m. The weed also grows in China, Malaysia and Africa.
English: Boerhavia diffusa – Spreading Hogweed, Punarnava or Red spiderling in Amaravati, Andhra Pradesh, India. (Photo credit: Wikipedia)
The plant is a creeping herbaceous perennial which is branched diffusely. It is a very common weed of sandy tracts, waste lands and at road sides. Leaves are greenish in colour and the stems are greenish purple coloured. They are bitter in taste.
Punarnava consists of quinazoline alkaloids namely punarnavine and punernavoside, an antifibrinolytic agent. It also contains potassium nitrate, an oily substance and ursolic acid.