Cyanthillium cinereum

Cyanthillium cinereum (also known as little ironweed and poovamkurunnal or poovamkurunnila in Malayalam, and monara kudumbiya in Sinhalese) is a species of perennial plants in the sunflower family. The species is native to tropical Africa and to tropical Asia (India, Sri Lanka, Indochina, Indonesia, etc.) and has become naturalized in Australia, Mesoamerica, tropical South America, the West Indies, and the US State of Florida. Cyanthillium cinereum is an annual herb up to 120 cm (4 feet) tall. It produces flat-topped arrays of numerous flower heads, each with pinkish or purplish disc florets but no ray florets. The species can be confused with Emilia sonchifolia, but the flower bracts of the latter are much longer and vase-shaped. Cyanthillium cinereum has been used for smoking cessation in Thailand and other countries, and as relief for the common cold. It used to be called Vernonia cinerea, but apparently there was a taxonomic update, sometime prior to early 2014. It's also called Sahadevi. This is a special medicinal plant used in Ayurveda. Its leaves are green and shiny, and the flowers are white or light purple in color. This plant naturally helps boost the body's immune system. It is mostly grown in warm and humid regions.

from Wikipedia