Kakmachi or Black nightshade, Solanum nigrum

Kaakmachi or Black nightshade (Solanum nigrum, family: Solanaceae) is a perennial herb with soft stem and many branches. It is native to Eurasia and introduced to the tropical and sub-tropical regions of the world.

Common names: Black nightshade, Garden nightshade

Fruit is a berry, smooth, 5-7 cm in diametre; green and bitter when raw and black or purplish black. In Bangladesh and Indian subcontinent another variety is found with berries that turn yellowish red when ripe. Ripe berries are attractive but poisonous. 

The flowers are small, pure white, clustered.

Solanum nigrum is used in ulcer, piles, fever, vomiting, swelling, urinery and liver diseases.