looks like Bauhinia

Are there flowers or fruit?  It might be Coccoloba depending on the region.  Are the leaves thick and waxy?

Although I see no flowers but has some resemblance to Talipiriti (T. tiliaceum, T. pernambucense) and Thespesia (T.populnea) (Malvaceae).

If it's leaf lobed at the leaf tip and the pink flowers are distributed over the old growth then this plant could be Cercis siliquastrum. On the other hand, if the leaf lobed on the both leaf ends( top and bottom ) and the pink flowers over the branch (old and young); this plant could be Bauhinia variegata. 

My first idea had actually been that it might be Cercis

As far as I understand, it was stated at the beginning that the leaf margin is serrate. Bauhinia, Cercis, Coccoloba should have entire margin. It really could be Talipariti.

Ok.

thank you very much.

this is Talipiriti tiliacecum.

I think this is Hibiscus tiliaceus of the family Malvaceae

Hibiscus tiliaceus L is the correct name of this plant.

is it marsh plant? leaves have minute serrate in edges. i have doubt with Hibiscus tiliaceus L??

To answer these questions we need better images of leaves, flowers and fruits.

Have a better image ?.

Hibiscus tiliaceus is a marsh plant, rather it loves to grow near water sides along lakes or near mangrove areas.