I was going by the three lobes on the end of the leaves and the 'cottony' hairs? I feel like it better fits the description for dentata? Which characters lead you to aculeata for this one? Such a variable group!
The tri-tipped leaves are not really of importance - they can be present in B.aculeata as well. But you make an excellent point about the cottony hairs; I had missed that the first time. You were correct in your inital ID :)