Vachellia planifrons (syn. Acacia planifrons), Jungle Nail, Fabaceae. A small armed tree, about 7m tall, with a typical flat crown from South India and Sri Lanka. In Sri Lanka, it is restricted to the arid sandy areas of Mannar Island and the coast opposite on the mainland.

The tree has two types of thorn at the base of petioles, two short, somewhat curved, thorns and two long straight thorns (both can be seen in the image). The pods curl into spirals or rings.

This is a butterfly nectar plant (van der Poorten & van der Poorten, 2016, The Butterfly Fauna of Sri Lanka).