Sorbus cambrensis, WELSH WHITEBEAM, is described and illustrated. It a member of subgenus Aria unusual in being pentaploid. endemic to six sites the eastern Brecon Beacons, Wales, ‘Endangered.’ was first noted as ‘large-leaved S. porrigentiformis’ 1970s 2009. closely related another pentaploid, stenophylla, both which may be derived from hybridisation between rupicola unknown members Aria.

Sorbus torminalis (WILD SERVICE TREE) is described and illustrated. It a species relatively isolated from its relatives, but role as parental taxon of hybridogenic noted. Notes on usage, cultivation propagation are included.

Oliver, S. J.; Goldschmidt, P.; Franceschini, A.; Serjeant, S. B. G.; Efstathiou, A.; Verma, A.; Gruppioni, C.; Eaton, N.; Mann, R. G.; Mobasher, B.; Pearson, C. P.; Rowan-Robinson, M.; Sumner, T. J.; Danese, L.; Elbaz, D.; Egami, E.; Kontizas, M.; Lawrence, A.; McMahon, R.; Norgaard-Nielsen, H. U.; Perez-Fournon, I. and Gonzalez-Serrano, J. I. (1997). Observations of the Hubble Deep Field with...

Michael Balls, Alan M. Goldberg, Julia H. Fentem, Caren L. Broadhead, Rex L. Burch, Michael F.W. Festing. John M. Frazier, Coenraad F.M. Hendriksen, Margaret Jennings, Margot D.O. van der Kamp, David B. Morton, Andrew N. Rowan, Claire Russell, William M.S. Russell, Horst Spielmann, Martin L. Stephens, William S. Stokes, Donald W. Straughan, James D. Yager, 18 Joanne Zurlo and Bert F.M. van Zutphen

Sorbus cuneifolia, LLANGOLLEN WHITEBEAM, is described and illustrated. Details relating to its recognition as a distinct species are provided.