The orange squares on this map show the distribution of ancient woodland in the County; the size of the squares is proportional to (but larger than) the area of each wood. The black dots relate to the number of ancient woodland indicator plants recorded from each site. As one would expect, there is a strong correlation between these two elements, but the map also shows that there are large ancient woods with a low diversity of such plants. In some cases this is due to coniferisation or other changes to the habitat, in others it can be due to the underlying soil type (note several such sites in the Sandlings). The species used are: Yellow Archangel (Lamiastrum galeobdolon), Early Purple Orchid (Orchis mascula), Herb Paris (Paris quadrifolia), Sanicle (Sanicula europaea), Greater Butterfly Orchid (Platanthera chlorantha), Oxlip (Primula elatior), Wood Anemone (Anemone nemorosa), Wood Millet (Milium effusum), Wood Melick (Melica uniflora), Wood Sedge (Carex sylvatica), Goldilocks (Ranunculus auricomus), Broad-leaved Helleborine (Epipactis helleborine), Wood Spurge (Euphorbia amygdaloides), Great Woodrush (Luzula sylvatica) Sweet Woodruff (Galium odoratum), Hairy St John's Wort (Hypericum hirsutum), Wild Cherry (Prunus avium) and Crab Apple (Malus sylvestris).