Saptaparna

Alstonia scholaris, called blackboard tree, scholar tree, milkwood or devil's tree, is an evergreen tree of the oleander and frangipani family, with a natural range from Pakistan to China and south to northern Australia. It grows up to 40 metres tall and every part exudes white sap when cut. The small tubular flowers are cream or white and strongly scented. The species name scholaris refers to the traditional use of its timber for blackboards in Myanmar. The page says it is a toxic plant, though it is used traditionally for many illnesses. At high doses an extract damaged all the major organs in rats and mice, and the bark collected in summer was the most toxic. The toxic effects may be due to the alkaloid echitamine in the bark. It is the state tree of West Bengal, where it is called the chhaatim tree, and its leaves, saptaparni, are awarded to graduates at Visva-Bharati University.