It is Bauhinia purpurea, commonly known as butterfly tree, orchid tree, geranium tree, , kachnar, sona, karali etc.belonging to the pea family (Fabaceae). The most distinguishing feature to identify the species from other similar bauhinia ( B. variegata) is that its petal do not over lap and the flower has only 3 long stamens.
Dr. Mahadeswara swamy