Vol. 35: Christensen, Knud Ib: Revision of Crataegus sect. Crataegus and nothosect. Crataeguineae(Rosaceae- Maloideae) in the Old World.1992. 102 figs. 199 p.gr8vo.Paper bd.

This revision of the Old World taxa of Crataegus sect. Crataegus and ofthe newly described nothosect. Crataeguineae, subfam. Maloideae, isbased on field work and herbarium study. The taxonomic history isreviewed, and morphology and infrageneric relationships as well as therole of hybridization are discussed. The taxonomic categories employedare defined. All available chromosome counts are listed in an appendix.Data concerning phenology, dispersal, habitats, and distribution aresummarized. All taxa are illustrated and their ranges mapped. Crataegussect. Crataegus consists of 26 species and 16 nothospecies (hybridspecies), distributed among 5 series, 3 subseries, and 5 nothoseries.