Mooching among the marsh orchids

I spent a very pleasant hour this afternoon at Southorpe Meadow NR, a hay-meadow with a wonderful array of wildflowers including a s somewhat baffling set of marsh orchids. The genus Dactylorhiza is notably promiscuous, and virtually all of them appear to be of hybrid origin. This one is probably a cross between Southern Marsh-orchid and Common Spotted-orchid, but DNA testing would probably be required to be sure!