""^WATSONIA 



JOURNAL OF THE 

 BOTANICAL SOCIETY OF THE BRITISH ISLES 



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

 Vol. 3 SEPTEMBER 1955 Pt. 4 



i SEP26 1E55 ) CONTENTS 



PAGE 



Variation in Arum maculatum. By C. T. Prime . . . . . . 181-185 



Notes on the Identification of Some British Species of Calli- 



TRiCHE. By Herbert Jones . . . . . . . . 186-192 



Cytogenetic Studies in the Dryopteris spinulosa Complex - I. 



By S. Walker . . . . . . . . . . . . 193-209 



Tragopogon pratensis in the Central Cotswolds. By D. M. 



Barling .. .. .. .. .. .. 210-212 



Taxonomic Studies in the genus Cerastium : I. C. atrovirens, 



C. pumilum, C. semidecandrum. By F. H. Whitehead . . 213-227 



A New British Species of Senecio. By Effie M. Rosser . . . . 228-232 



Notes on British Hieracia - I. By P. D. Sell and C. West . . 233-236 



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