Thanks Alan. In fact, I have just this minute contacted the editor to ask that this be changed to 'lupin' seed heads as this was my intention. As you rightly point out, 'lupine' refers to wolves.
A few years ago, while sitting in the garden something kept hitting me on the back of the head. I discovered I was being 'shot at' by a row of lupins that had almost dried out. The seed cases were bursting in the sun and dispersing the seeds. The cat was just as surprised as I was! :)
Yes, there were a lot of border attacks now so far from here during The Troubles. Thankfully this is no longer the case.