"'^WATSONIA 



JOURNAL OF THE 

 BOTANICAL SOCIETY OF THE BRITISH ISLES 



Editor : E. F. WARBURG, M.A., Ph.D. 



Vol. 3 NOVEMBER 1956 Pt. 6 



CONTENTS"^ /"-..r.N/ yy PAGE 



New Species and Combinations in the Genus Rubus L. 



By W. C. R. Watson . . . . . . . . . . 285-290 



A Biosystematic Study of some Glyceria species in Britain. 



I— Taxonomy. By Martin Borrill . . . . . . 291-298 



A Biosystematic Study of some Glyceria species in Britain. 



II— Cytology. By Martin Borrill . . . . . . . . 299-306 



Studies on Ononis in Britain. 1 — Hybridity in the Durham 



Coast Colonies of Ononis. By J. K. Morton. . . 307-316 



Generic Criteria in Flowering Plants. By T. G. Tutin . . 317-323 



Taxonomic Studies in the Genus Cerastium. II — Cerastium 



subtetrandrum (Lange) Murb. By F. H. Whitehead . . 324-326 



Reviews .. .. .. .. .. .. .. 327-328 



PUBLISHED AND SOLD BY THE 

 BOTANICAL SOCIETY OF THE BRITISH ISLES 

 c/o Department of Botany, British Museum (Natural History), London 

 Price Fifteen Shillings 



