The diversity of Sorbus L. (Rosaceae) in the Lower Wye Valley

摘要

The diversity of Sorbus in the Lower Wye Valley on the border between England and Wales is described. Sixteen Sorbus taxa occur in the Lower Wye Valley, including two new species which are described as S. parviloba T. C. G. Rich and S. saxicola T. C. G. Rich. Diverse, important sites include the Symonds Yat to Great Doward area, and the Pen Moel to Shorn Cliff area. Overall, the Lower Wye Valley is the second most diverse site for Sorbus in the British Isles. There is evidence of a minor decline in diversity of a few species at a few sites.