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

Food-dependent exercise-induced anaphylaxis (FDEIA) is characterised by the onset of anaphylaxis during (or soon after) exercise preceded by ingestion of a food allergen. In FDEIA, both food allergens and exercise are independently tolerated. This syndrome has been associated with wheat, seafood, peanut, egg, milk, vegetables and fruits. Rosaceae fruits may also be involved. There are two major...

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.

The micromorphology of pits in tracheary elements was examined in 35 species representing 29 genera of Rosaceae and related families to evaluate the assumption that angiosperm pits are largely invariant. In most Rosaceae, pit membranes between fibers and tracheids frequently appear to have amorphous thickenings with an irregular distribution. Although these structures are torus-like under the l...

Cyanogenic glycosides are a large group of secondary metabolites that are widely distributed in the plant kingdom, including many plants that are commonly consumed by humans. The diverse chemical nature of cyanogenic glycosides means that extraction and analysis of individual compounds can be difficult. In addition, degradation can be rapid under appropriate conditions. Amygdalin is one of the ...

T2-type RNases are responsible for self-pollen recognition and rejection in three distantly related families of flowering plants-the Solanaceae, Scrophulariaceae, and Rosaceae. We used phylogenetic analyses of 67 T2-type RNases together with information on intron number and position to determine whether the use of RNases for self-incompatibility in these families is homologous or convergent. Al...