12 CRUCIFER/E. 



Erophila verna, E. Meyer. 



3. Gribbin Head; Polmear near Par; Par Harbour, 1922, 

 Medlin. 



5. Wall, St. Merryn, 1918, Thurston. 



7. Pradannack Downs, 1914, Miss M. Cobbe. 



8. Lelant, 1913, Miss A. B. Cobbe. 



E. praecox, DC. (E. brachycarpa, Jord) . 



1. Wall between Bude and Stratton, 1915, Thurston. 



5. Reen Sands, Perranporth, 1916, Thurston. 



8. Sand-dunes, Hayle and Lelant, 1921, W. Watson. 



In a note on Erophila prcecox, the Rev. H. J. Riddelsdell 

 writes: " These elusive micr> species are all the more diffi- 

 cult to determine . . . because the colonies are by no 

 means homogeneous; and there is much obvious transition 

 between species, to say nothing of highly probable crossing. 

 Another difficulty arises from the fact that the pods vary in 

 shape even on a single plant." B.E.C., 1914, p. J 18. Cornish 

 plants of the two species require further study. 



Cochlearia officinalis, Linn. 



1. Whitstone, 1917, Tresidder. 



3. River-bank, Lostwithiel, 1920, Thurston. 



5. Trekenning, St. Columb Major, Vigurs. 



6. Seems to be spreading inland about St. Stephen-in-Brannel 

 and other places, Tresidder. Calenick creek, 1911, Foott. 

 Paradoe Cove, Gerrans Bay, 1913, Thurston. 



C. ang'ica, Linn. 



3. On turfy banks covered at spring tide between Looe and 

 Sandplace, Boyden, R./.C., /9/7, p. 376. 



C. Armoracia, Linn. 



1. Wall on river-bank, Boscastle, 1915, Thurston. 



5. Trevemper Bridge, 1909, Tresidder. 



6. Penarrow near Mylor, 1921, R. L. Smith and W. D. Watson. 

 8. Pentreath Farm, Pra, 1911, Davey. 



