In early summer 2010 the Botanical Society of the British Isles will be publishing Whitebeams, Rowans and Service Trees of Britain and Ireland. A monograph of Sorbus L. in Britain and Ireland by
T. C. G. Rich, L. Houston, A. Robertson and M. C. F. Proctor with the help of D. C. G. Cann, A. J. Lockton and D. T. Price.
This important work will give comprehensive accounts, with photos, maps and diagrams, of the 52 native or naturalised Sorbus taxa in Britain and Ireland and will be the standard guide for many years to come.
Details are available here: http://www.bsbi.org.uk/Soprbushandbookoverseas.pdf