Holm oak flower; Flor de encina

Evergreen oak or Holm oak is a medium-sized tree 20–27 metres tall with finely square-fissured blackish bark and leathery evergreen leaves. The flowers are catkins, produced in the spring; the fruit is an acorn, which matures in about six months. In the third picture the pollen can be seen as it is released when I touch it with my finger.