DIPLOTAXIS 6l 



botanist than to the farmer. It is, however, oft«n planted as an 

 agricultural crop. On the continent a form occasionally occurs in 

 which the seeds are brown in colour, but I have not seen it in 

 Britain. 



Brassica alba occurs in all the bordering counties. 



**B. ocHROLEucA, Beck, Fl. Xied. Oster. L 485 (1892). 



B. Erucastrum, Linn. var. ochroleuca, Gaud. FL Helv. iv. 381. B. Eru- 

 castrum, Lond. Cat. ed. 8. Erucastrum Pollichii, Schimp. & Spenn. in Fl 

 Frib. iii. 946. E. inodorum , Beichb. FL Germ. Exc. 693, and Ic. Fl. Germ. 

 et Helv. ii. f. 4428. Xyman, 48. Comp. Cyb. Br. 485. 



Casual. Waste ground. Bare. A. June-July. 



2. Ock. On waste ground at Gran dpont. By the railway-side at Didcot 



[B. OLERACEA, Linn. Sp. PL 667 (1753). A maritime species recorded in error 

 by Dr. Xoehden in Mavor's Agr. Berks, 1809.] 



**B. ELosGATA, Elirh. Beitr. viL 159 (1792). 



Erucastrum elongatum. Reichb. Ic. FL Germ, et Helv. ii. f. 4430. Xyman. 46. 



Alien. Some fine specimens are naturalized on the bridge wall near Wytham 

 Mill. I have also found it near Didcot Station. 



**B. Cheiraxthos, YilL Prosp. 40 (1779). 



Sinapis Cheiranthus, M. and K. Deutsch, FL iv. 717. Comp. Cyb. Br. 485. 

 Beichb. Ic. Fl. Germ, et Helv. iL f. 4432. Xyman, 47. 



Alien. A casual by the railway at Didcot. 



DIPLOTAXIS. DC. Svst. ii. 628 ^1821^ 



D. tenuifolia, DC. 1. c. 632. WalJ Rocket. 



Sisymbriujyi tenui/oiium, Linn. Amoen. Acad. iv. 279. Brassica tenuifolia, 

 Baill. Hist. PL iii. 227. 



Top. Bot. 50. Syme. E. B. i. 139, t. 93. Xyman, 49. Fl. Oxf. 32. 

 ]S^ative. Rupestral. Old walls. Ytry local. P. June -September. 

 First record. Brassica Erucastrum, Huds. FL Angl. 253. Windsor 



Castle, Br. Lighf/oot's MS. about 1770. See also Smith's Fl. Brit., Sm. 



Engl. Flora and Phyt. v. 368. n. s. 



4. Kennet. On the walls of Reading Abbey, Herb. Brit. Mus.. where 



it is still abundant. Probably D. muralis of T. B. Flower in 

 Robertson's Env. of Reading, 1843, refers to this plant. 



5. Loddon. On the walls of Windsor Castle, Lightfoot. Walls of 



the Terrace of Windsor Castle, Phyt. I. c. 

 This plant is not recorded from Oxfordshire, Bucks, Wilts, or East 

 Gloucestershire, while in Hampshii-e it appears to be limited t<i> 

 Southampton. 



D. muralis, DC. Syst. ii. 634 (1821). 



Sisy7nbrium murak, Linn. Sp. PI. 658 '1753. Brassica brevipes, Syme, 

 1. c, pro parte. 



Top. Bot. 50, Syme. E. B. i. 140, t. 94. Nyman, 49. Fl. Oxf. 32. 



