I captured this rosa canina, commonly known as dog rose, and bearing the fruit, rose hip (though not fruiting when I photographed it) on my walk past Grove Park Nature Reserve to Hither Green Cemetery earlier in the month.
There are various theories for the origins of the plant's name. As you might imagine, my favoured one (though likely not scientifically proven) is that the plant can cure the bite of a mad or rabid dog.
As with many flowers and plants, it's the county flower in one country (Hampshire, England) and an invasive weed in others (NZ and Australia).
But it is pretty.