Mercurialis perennis
There is a good variety of vascular plants that are considered to be indicators of undisturbed, ancient woodland. These include Herb Paris ("Paris quadrifolia"), Lily-of-the-valley ("Convallaria majalis"), Ramsons ("Allium ursinum"), Wood Sorrel ("Oxalis acetosella"), Wood Anemone ("(Anemone nemorosa"), Dog's Mercury ("Mercurialis perennis"), Woodruff ("Galium odoratum"), and Wood-sedge ("Carex sylvatica").