42 



VI. CRUCIFER^ : BRASSICE^. \_Diplotdxis. 



Corn-fields, too frequent. ©. 5 — 8, — Stem 1 — 2 ft. 

 Flowers rather large, yellow. Calyx very spreading, 

 pod usually empty, sometimes with one seed. 



high, rough. 

 Beak of the 



4. 



M.) 



shorter and 



slightly narrower than the flat ensiform beak, leaves pin- 

 natifid. E. B. t. 1677. 



Waste places, frequent in England ; more rare in Scotland. Q, 

 Stem 1 — Ijft. high, sparingly hairy or glabrous. Leavel 



6, 7. 



ii> 



usually glabrous, the lobes variously cut and toothed, or erose. 

 Flowers large, yellow. Well distinguished from the other British 

 species by its long, thin beak, which contains a single seed. 



30. DiPLOTAxis De Cand. Rocket. 



Tod linear, compressed (with usually an empty beak), 2- 

 valved ; the valms slightly convex, 1-nerved. ' Seeds (oval or 

 oblong) in two rows. Calyx patent. — Named from (^ittXoc 

 double^ and raliq^ a series^ in allusion to the two rows of seeds. 



r 



\ 1. D. tenuifolia DC. {Wall R.) ; pods shortly beaked erect, 

 pedicels spreading, stems erect leafy glabrous somewhat woody 

 at the base, leaves lanceolate very acute pinnatifid or bipinna- 

 tifid glabrous. Sisymbrium Z. ; E. B. t. 525. Sinapis Br. 



Old walls and heaps of rubbish about great towns, in the south, 

 south-west, and east of England: as London, Bristol, Yarmouth, 

 Chester, Tynemouth, and Shields. St. David's, Fifeshire, but in- 

 troduced with ballast. 7^. 6— 9. — Root thick. Stem 1— U ft. 



high, glabrous, almost woody at the base. Flowers large, yellow. 

 This plant smells disagreeably. 



2. D. murdlis DC. (Sand R,) ; pods shortly beaked erect, 

 pedicels spreading, stem herbaceous hispid spreading leafy only 



Sisymbrium Z. ; E, B. 



at the base, leaves sinuate glabrous. 

 t. 1090. Sinapis Br. 



Sandy barren fields near the sea, in the south and south-west of 

 England ; Isle of Thanet, and below Bristol ; also at Tynemouth and 

 Shields. Edinburgh and Dunfermline, but not truly wild. ©. ^j^* 



Very like the preceding, but annual, and much smaller and less 

 leafy. 



Tribe X. Velle^, Pouch with the valves convex ; dissepi' 



ment broad. Cot. o > >. (Gen. 3L) 



r 



31. Vella LiJin. Cress-rocket. 



Pouch swollen, 2-celled, with a dilated, flat, winged styh 

 twice as long as the vaUes. Seeds 4 in each cell Cal erect. 



Named from veler in Celtic (in modern Gaelic biolar% tlie 

 cress. 



B, 



k 



