CAREX FLAVA AND ITS ALLIES— III 



79 



Likewise the colour of the female glumes is useful in separating C. serotina and 

 C. scandinavica, for the glumes of C. serotina are frequently pale yellow-brown and 

 hyaline, while those of the latter species are dark brown. 



This character has always been found to remain constant in cultivation and shows 

 little variation under different ecological conditions. 



Conclusions 



This morphological and biometric study and the transplant experiments have shown 

 that the phenotype may be modified much more profoundly by environment in the 

 vegetative parts of these sedges than the floral parts ; in the latter the appearance of the 

 phenotype is almost entirely the expression of their genotype. For this reason the arrange- 

 ment and the spikes, and the dimensions and shape of the perigynia have been found the 

 most reliable criteria for identification and classification, while the growth form and size 

 of the plant, and length and breadth of the leaves have proved useful auxiliary characters. 



REFERENCES 



DAVIES, E. W., 1953a, Notes on Carex flava and its allies : I. A sedge new to the British Isles, Watsonia, 3, 

 66-68. 



, 1953b, Notes on Carex flava and its allies : II. Carex lepidocarpa in the British Isles, 



Watsonia, 3, 69-72. 



NELMES, E., 1939, Notes on British Carices : V. Carex oederi Retz., /. Bot., 77, 301-304. 



, 1947, Two critical groups of British Sedges, Rep. Bot. Soc. & E.C , 13, 95-99. 



, 1949, Carex flava and its allies, in Wilmott, A. J., Byitish Flowering Plants & Modern Systematic 



Methods, 85, London. 



SENAY, P., 1950, Le groupe des Carex flava et C. oederi. Bull. Mus. Nat. Hist. Nat., Paris, 2me serie, 22, 

 618-624. 



, 1950, Le groupe des Carex flava et C. oederi. Bull. Mus. Nat. Hist. Nat., Paris, 2me serie, 22, 



790-796. 



, 1951, Le groupe des Carex flava et C. oederi, Bull. Mus. Nat. Hist. Nat., Paris, 2me serie, 23, 



146-152. 



STEBBINS, G. L., 1950, Variation and Evolution in Plants, Oxford. 



TUTIN, T. C, 1952, in CLAPHAM, A. R., TUTIN, T. G. and WARBURG, E. F., Flora of the British 

 Isles, Cambridge. 



WIINSTEDT, K., 1947, Bidrag til Polymorfien hos den Tidligere som Carex Oederi Retz. kendte Art, Bot. 

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