Mercurialis perennis
Dominating the ground cover are plants like the wood bluegrass ("Poa nemoralis"), wavy hair-grass ("Avenella flexuosa"; especially in dry oak woods), white wood-rush ("Luzula luzuloides"), male fern ("Dryopteris filix-mas"), limestone oak fern ("Gymnocarpium robertianum"), wall hawkweed ("Hieracium murorum"), baneberry ("Actaea spicata"), small balsam ("Impatiens parviflora"), Herb Robert ("Geranium robertianum"), dog's mercury ("Mercurialis perennis").