The Butterfly and the Flower

Natures are truly beautiful! No matter what, its Creator is truly magnificent! Here is a very nice shot of the butterfly on top of the flower. He seems to enjoy sipping the flowers. Me and my wife had a visit last time in Landesgartenschau or City Garden in Neumarkt. This is not professionally taken but I still love the outcome. Any idea about the name of these flowers? thanks in advance!