I have seen the pictured bush today when hiking around [Las Palmas de Gran Canaria](http://en.wikipedia.org/wiki/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.

![bush](https://i.stack.imgur.com/9EPRI.jpg)
![closeup](https://i.stack.imgur.com/BCUg7.jpg)

**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.

![bud and wasp](https://i.stack.imgur.com/HrDnJ.jpg)