Cantueso. The name of this lavender variety. It used to be thought of as the same as a similar-looking Provençal variety; it looks the same. But DNA profiling proved it was distinct. By the way, the two top 'petals' are in fact modified leaves.
ADDED NOTE: It seems I was misinformed. This Wilki link is more accurate and up-tp-date!
es.wikipedia.org/wiki/Lavandula_stoechas