Curcuma caesia, black turmeric or black zedoary is a perennial herb with bluish-black rhizome, native to North-East and Central India. The rhizome of black turmeric has a high economic importance owing to its putative medicinal properties.

In west Bengal, the rhizome of the plant is used in Kali Puja, and hence the plant is called Kali haldi. The leaves have a deep violet-red patch which runs through the length of the lami