HYBRIDISATION OF EUPHRASIA 



269 



District 2 : Kit Hill, Callington, Rilstone, 1917 (K), Rilstone & Thurston, 1923 (K), (locality for 



E. anglica (as E. rostkoviana) , Hammond (DF)). 

 District 1 : Kittows Moor, near Treneglos, Little, 1924 (BM, CGE, PM), (locality for £. micrantha, 



Little, 1924 (CGE, K, PM.)); WilseyDown, near Treneglos, Little, 1924 (C); Laneast Downs. 



Marsden-Jones, 1929 (K). 



V.C.3. S. DEVON. 



Roborough Down. Vigurs, 1906 (CGE), Sara, 1907 (CGE), Simpson, 1939 (S), Yeo, 1953 (locality 

 for E. cf. micrantha (E. " nemorosa" in this paper); Simpson, 1939 (S), Yeo, 1952, and for 

 E. anglica, Yeo, 1952); Horrabridge, Roborough Down (N. end), Stephenson, 1937 (BM); 

 Yelverton. Williams, 1925 (CGE, K, S); Yannadon Down, Yelverton, Hume, 1902 (BM), 

 (locality for E. micrantha, Hume, (PM)); near Hand Tor, Dartmoor, Stephenson, 1937 (S); 

 Lydford. Dartmoor. Martin (BM). 



REFERENCES 



ANDERSON. E. & HUBRICHT. L., 1938, Hybridisation in Tradescantia : III, Introgression. Am. /. Bot., 

 25. 396-402. 



BUCKNALL, C, 1917. British Euphrasiae, /. Bot., 55, SuppL, 1-28. 

 DAVEY, F. H., 1907. Euphrasia Vigursii, sp. n., /. Bot., 45. 217-220. 

 , 1909. Flora of Cornwall, Penryn. 



GILMOUR. J. S. L. & HESLOP HARRISON, J., 1954. The Deme Terminology and the Units of Micro- 

 Evolutionary Change, Genetica, 27. 147-161. 



MANTON. I., 1950, Problems of Cytology and Evolution in the Pteridophyta, Cambridge. 



MONTZING, a.. 1937. The effects of Chromosome Variation in Dactylis, Hereditas, 23, 113-235. 



PUGSLEY. H. W.. 1930, A Revision of the British Euphrasiae, /. Linn. Soc. Lond., Bot., 48, 467-544. 



, 1933, Notes on British Euphrasias, III. /. Bot., 71. 83-90. 



RILSTONE. F., 1923. The Distribution of Euphrasia in Cornwall. /. Bot., 61. 54-56. 



TURESSON, G., 1922, The Genotypical Response of the Plant Species to the Habitat, Hereditas, 3. 

 100-113. 



VALENTINE. D. H., 1950. The Experimental Taxonomy of Two Species of Viola, New PhytoL, 49, 

 193-212. 



VIGURS, C. C. 1908, in Report of Distributor for 1907, Rep. Bot. Exch. CI. B.L, 2, 304. 

 WARBURG, E. F.. 1952, in Clapham, A. R., Tutin. T. G. & Warburg, E. F., Flora of the British 

 Isles, Cambridge. 



YEO, P. F., 1954. The Cytology of British Species of Euphrasia. Watsonia, 3, 101-108. 



