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The isle has the highest number of species of native and anciently introduced wild flowers of any area of comparable size in Britain. This is largely due to the varied geology. The species most frequently sought is Early Spider Orchid ("Ophrys sphegodes"), which in Britain, is most common on Purbeck. Nearly 50,000 flowering spikes were counted in 2009. Late April is the best time, and the largest population is usually in the field to the west of Dancing Ledge. Smaller numbers can be seen on a shorter walk in Durlston Country Park. This orchid is the logo of the Dorset Wildlife Trust. Cowslip meadows ("Primula veris" and "Primula deorum") are at their best shortly afterwards and Durlston Country Park has several large ones.