Can anyone help me identify this particular tree?
It grows at least in Portugal (north and south).
This branch is obviously dry.
It could be a Tamarix, e.g. Tamarix africana: it grows on souther Portugal and near the costs in northern Portugal. See http://www.florestar.net/tamargueira/tamargueira.html. But I find no good pictures of branches, so I cannot verify.
It remember me also a lot the Callistemon, see e.g. the picture in: https://en.wikipedia.org/wiki/File:Bottlebrush_seeds.jpg, but it is not native of Portugal.