This tree is known as Sitapatra in local Bengali language. When you scratch the surface of the leaf, the scratch marks turn black (because the fluid turns dark upon contact with air). It can grow from coppices. I never saw the tree in flower in the past 15 years - until this April. Distribution: western lateritic districts of West Bengal and Jharkhand.
I think this is some Verbenaceae plant, Probably some species of Callicarpa or Clerodendrum. I am not very familiar with Bengali species.
Dear Bo Li, Still cannot find a good photo or graphics of Cordia bantamensis to check. If that's the species, are you sure C. bantamensis has distributional range in eastern India? Currently this tree is extremely rare in the entire West Bengal, Jharkhand, Bihar Odisha (States of eastern India) and Bangladesh.
Dear Bo Li, upon close examination and matching the photos that you sent me, I am almost certain that Sitapatra is either Ehretia laevis or E. dicksonii. Here are the photos of the fruits of Sitapatra. The pointed "beak" of the fruit does not match that of Ehretia laevis or E. dicksonii.
I agree with Jacob Thomas and Bo Li. The cupuliform calyx and the pentamerous flower match Cordia very well. The genus is quite complex and to my knowledge, there is no current species key for South Asia.
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