The relationship between "A. decemarticulatus" and "H. physophora" is very specialized. "H. physophora" is a small tree in the Amazonian rainforest that resides in the undergrowth. It is also an example of a myrmecophyte, because it contains ant-domatia, leaf pouches and hollow chambers where the ants nest permanently. These leaf pouches occur when the edge of a leaf adjacent to the petiole curls under. The result is two hollow spheres on both sides of the stem of the leaf. The ants live inside of these domatia. There is only one colony per tree, but that colony divides up into many different domatia. Also located in the leaf pouches are extrafloral nectaries, which provide the ants with nectar made by the plant, and also some food bodies that provide the ants with further nutrition as they mature to become foragers and insect predators. This is the first known instance of extrafloral nectaries being observed inside of ant-domatia.