Wales has a rich and varied flora of about 1200 native and anciently-introduced flowering plants, conifers and ferns. Amongst these are many special plants from arctic-alpine relics of the last Ice Age to recently evolved species and medicinal herbs. They range from short-lived annual grasses to long-lived trees and vary ecologically from those growing on the seashores to those on the tops of mountains. Some are widespread around the world and some...