Cyclone Dana brought heavy rain to Kolkata, causing chhatim trees (Alstonia scholaris) to shed their strong-smelling flowers, offering relief for allergy and asthma sufferers. It is a tropical tree in the dogbane family (Apocynaceae). Alstonia scholaris, also called blackboard tree, scholar tree, or devil’s tree, is native to the Indian subcontinent, Southeast Asia, and southern China. Known as “saptaparni” in India, it has clusters of seven leaves and blooms small, fragrant greenish-white flowers in late autumn. The tree’s bark and leaves are used in traditional medicine for respiratory, skin, and digestive issues. Its wood was once used to make blackboards, hence the name “blackboard tree.”
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