GeoGraph - photograph every grid square

A handsome native plant that likes damp places and sends up its tall, fiercely-pink flowering stems in the swampy valley behind the beach. Each plant's flowers may vary in having between 5 and 7 petals - this one has 6 - and there are several other variations in its floral anatomy too.
Its generic name, Lythrum, comes from the Greek word for blood, and the word 'loosestrife' refers to a supposed power to calm oxen. Its country name 'long purples' was sometimes confused with Shakespeare's use of the same name for early purple orchids in the description of Ophelia's death by drowning in Hamlet, and illustrated thus in the famous painting by Millais. See Link