WATER RELATIONS OF SAND-DUNE PLANTS 189 



Sayre,J.D. (1926) Physiology of stomata o{ Rumex patientia. Ohio J. Sci. 26, 233-266. 

 Slatyer, R. O. (1957) The significance of the permanent wilting percentage in studies 



of plant and soil water relations. Bot. Rev. 23, 585-636. 

 Stalfelt, M.G. (1929) Die Abhangigkeit der SpaltofFnungsreaktionen von der 



Wasserbilanz. Pknta, 8, 287-340. 

 Stalfelt, M.G. (1932) Der stomatare Regulator in der pflanzlichen Transpiration. 



Platita, 17, 22-85. 

 Stalfelt, M.G. (1955) The stomata as a hydrophotic regulator of the water deficit 



of the plant. Physiol. Plant. 8, 572-593- 

 Stocker, O. (1929) Das Wasserdefizit von Gefasspflanzen in verschiedenen Klima- 



zonen. Planta, 7, 382-387. 

 Weatherley, p. E. (1950) Studies in the water relations of the cotton plant. I : The field 



measurement of water deficits in leaves. Neiv Phytol. 49, 81-97. 

 Williams, W.T. (1949) Studies in stomatal behaviour. Ill: The sensitivity of stomata 



to mechanical shock. Ann. Bot., Lond., N.S. 13, 309-327. 

 WaLiAMS, W.T. & Amer, F.A. (1957) Transpiration from wilting leaves. J. exp. 



Bot. 8, 1-19. 

 Willis, A.J., Folkes, B.F., Hope-Simpson, J. F. & Yemm, E.W. (1959) Braunton 



Burrows: the dune system and its vegetation. Part II. J. Ecol. 47, 249-288. 

 Yemm, E.W. & Willis, A. J. (1954) Stomatal movements and changes of carbo- 

 hydrate in leaves oi Chrysanthemum maximum. New Phytol. 53, 373-396- 



