I have seen the pictured bush today when hiking around Las Palmas de Gran Canaria. From a distance, hexagonal patterns are visible: Adjacent branches grow in an almost perfect 45° angle relative to each other.
What plant is this, or what is a strategy for finding that out?
If you need more information, let me know.
Update: Below a picture, that I took after @Throsby's answer, for confirmation. It shows the closeup of a bud, plus mating behavior. ;-) This bush is in a different location than the one pictured above.