Is that a navel?

In a sense, yes. Not mine of course, Venus navel, which is obviously much better. Not the real one either, this is not an erotic site, you know. Venus navel (Nombril de Venus) is the name given in French (and actually in several European languages) to the Pennywort (Umbilicus pendulinus or Umbilicus rupestris), shown above, probably because of the shape of its leafs. The pennywort, also called navelwort, is commonly found on European granitic lands, especially in wall and rock crevices.