40 , CRUCI FERAE 



Comp. Cyb, 485. Syme, E. B. i. 154, t. 106. Baxt. t. 237. Nyman, 



31. Fl. Oxf. 22. 

 Denizen. Rupestral. Old walls. P. April-June. 

 First record. On old stone walls about Drayton and Sutton [Courtney], 



Mr. J. Lousley in Russell's Cat. of 1839. 



1. Isis. Wytham. Faringdon. 



2. Ock. Drayton and Sutton [Courtney], Lousley. Abingdon. 



Marcham. 



3. Pang. Streatley. Pangbourn. Bucklebury. 



4. Kennet. Reading Abbey walls. Kintbury. West Ilsley, &c. 



5. Loddon. Sonning. Cookham. Windsor Castle. Shottesbrooke. 

 In none of these localities is Cheiranthus a native plant. On the 



wall of Reading Abbey it is completely naturalized, and occurs some- 

 times Avith the flowers smaller in size and of a uniform pale yellow 

 (the C.frutkulosus of Sm. E. B. t. 1934), but all gradations between this 

 and the brown- flowered plant may be found. 



The so-called variety gijnantherus, DC, which is only a monstrous 

 form, was observed in the same locality in 1892. 



The Wallflower occurs in a more or less naturalized condition in all 

 the bordering counties. 



RORIPA, Scop. Fl. Cam. 520 (1760). Adans, Fam. ii. 417 (1763). 

 Nasturtium, R. Br. in Alton, Hort. Kew. iv. 109 (1812). 



R. Nasturtium, Beck, Fl. Nied. Oster, ii. 463 (1892). Water Cress. 

 Sisymhriuyn Nasturtium-aquaticum, Linn. Sp. PI. 657 (1753). Nastur- 

 tium aquaticum vulgare, Park. Cardamine Nasturtium, Moench, Meth. 

 262. Nasturtium officinale, R. Br. I.e. iii. This name is adopted 

 in Index Kewensis. 



Top. Bot. 43. Syme, E. B. i. 176, t. 125. Nyman, 35. Baxt. t. 271. 

 Fl. Oxf. 25. 



Native. Paludal. Brooks, ditches, and wet places. Common and 

 generally distributed, but especially abundant in streams issuing 

 from the base of the chalk escarpment in the Ock district. P. 

 April- October. 



First record. Lesser Watercress in all the Oxford ditches, MS. in Lyte's 

 IlerbaU, 1660. Published as Sisymbrium nasturtium in Mavor's Agr. 

 Berks in 1809. 

 Water Cress is extensively grown in springs thrown out at the base 



of the chalk escarpment, as at Uflington, Ashbury, Kingston, Hagborne, 



and also in the stream near Bradfield and Standford Dingley. 



There are several forms of the Water Cress, and two varieties have 



been admitted into our British Floras. 



Var. MicROPHYLLA, Beck, 1. c. {Nasturtium microphyllum, Boenn. in 



Reichb. Ic. FL Germ, et Helv. ii. f. 4360). It is usually found on the 



