543. Quercus × Warburgii

Summary.  Quercus × warburgii A. Camus, the Cambridge Oak, is a semi‐evergreen tree of hybrid origin, possibly between Q. rugosa Née and Q. robur L., and is only known in cultivation. Mature trees in gardens are extremely rare. Its history and cultivation are discussed.     

541. Corylus × Vilmorinii

Summary.  The hybrid hazel, Corylus  ×  vilmorinii Rehder is described and illustrated. Its robust habit and showy catkins make it an interesting and worthwhile tree to cultivate.     

545. Rosa × Pteragonis 'Cantabrigiensis'

Summary.  Rosa 'Cantabrigiensis' is a hybrid whose history is connected with Cambridge University Botanic Garden where it was raised and first recognised in 1922. Its origin in the experimental work on Rosa by Charles Hurst is discussed, and its likely parentage is given.     

1066. Viburnum oliganthum Batalin: Viburnaceae

Viburnum oliganthum Batalin is illustrated in flower and fruit: its relationships and ecology are discussed. Instructions for its successful cultivation are given.     

508. Aloe Descoingsii

Summary.  Aloe descoingsii Reynolds, the smallest Aloe species in the world, endemic to Madagascar, is described and illustrated. Its history, ecology and conservation status are discussed. Its habitat is shown.     

558. Impatiens Salpinx

Summary.  The Central African balsam Impatiens salpinx Schulze & Launert, endemic to the Chimanimani Mountains, is described and illustrated. Its taxonomy, ecology, pollination and cultivation requirements are discussed.     

529. Primula Moupinensis

Summary.  Primula moupinensis Franch. is described and illustrated; details of its ecology and its cultivation are given.     

527. Lathyrus Davidii

Summary.  Lathyrus davidii Hance from eastern Asia is described and illustrated. The possible significance of changes in flower colour is discussed.     

513. Masdevallia Idae

Summary.  The rare and little‐known Masdevallia idae Luer & Arias ( Orchidaceae ) from Peru is described and illustrated from the type collection, and the work of Carlyle Luer and Stig Dalström on the genera Masdevallia and Dracula is highlighted.     

501. Rubus Calophyllus

Summary. A rare bramble from the eastern Himalaya, Rubus calophyllus C.B. Clarke is illustrated. Its distribution and habitat are described and related species are discussed.     

551. Rosmarinus Eriocalyx

Summary.  Rosmarinus eriocalyx Jord. & Fourr., an aromatic shrub native to southern Spain and North Africa is a fairly recent introduction to cultivation. The generic and specific relationships, taxonomic history and natural variation are discussed and experience of its cultivation described.     

Gerard M. Guiraudon

Netherlands Heart Journal -