BRASSICA.] CRUCIFER^. 33 



Channel Islands ; (a native ? Wats.} ; fl. June-Sept. Annual. Stem 2-3 ft. 

 rigid, branched, more or less hispid. Leaves 4-8 in., lower lyrate, terminal 

 lobe much the longest. Flowers f-| in. diam., bright yellow. Pod J-| in., 

 subulate, beak slender; valves keeled, torulo?e; pedicel short, stout, erect ; 

 cells 3-5-seeded ; seeds oblong. DISTRIB. Europe, N. Africa, W. Asia to 

 the Himalaya; introd. in U. States. 



5. B. adpres'sa, Boiss. ; uppermost stem-leaves linear or lanceolate 

 quite entire hispid, pods subcylindric, beak clavate ribbed J as long as 

 the valves often 1 -seeded. Sina'pis inca'na, L. Erucastrum inca'num, 

 Koch. 



Sandy fields, Jersey and Alderney ; casual in Ireland ; fl. July- Aug. Habit 

 of B. ni'gra, but more branched ; pod ^ in. ; valves linear ; beak 8-ribbed ; 

 seeds fewer, flattened. DISTRIB. Europe, from Belgium southd. 



** Pods spreading ; valves 3-nerved ; cells few- or many-seeded. 



6. B. Sina'pis, Visiani; hispid, upper leaves toothed or lyrate-pinnatifid, 

 pods linear angular longer than the elongate compressed rarely 1-seeded 

 beak. B. Sinapis'trum, Boiss. Sina'pis arven'sis, L. Charlock. 

 Cornfields, N. to Shetland ; ascending to 1.200 ft. ; Ireland ; Channel Islands ; 



fl. May- Aug. Annual. Stems 1-2 ft., usually branched. Flowers |-J in., 

 diam., subcorymbose, bright yellow, homogamous. Pods l|-2 in. ; pedicel 

 slender, spreading ; beak deciduous, straight, almost rigid, as broad as the 

 hispid torulose valves ; seeds subcompressed, dark brown. DISTRIB. Europe, 

 N. Africa, N. and W. Asia to the Himalaya ; introd. in America. 



7. B. al'ba, Boiss. ; hispid with reflexed hairs, upper leaves pinnatifid, 

 pods short beaded few-seeded, valves equalling the broad sometimes 1- 

 seeded beak. Sinapis, L. White Mustard. 



Cultivated ground, &c., from Eoss southd. ; Mid. Ireland rare ; Channel 

 Islands; (a colonist, Wats.); fl. June-July. Annual. Stem 1-3 ft., erect, 

 furrowed ; branches ascending. Leaves all lyrate-pinnatifid or pinnate ; 

 segments cut and lobed. Flowers \ in. diam., yellow. Pods 2 in., hispid ; 

 valve strongly ribbed, concave ; beak ensiform, persistent, ribbed, often 

 curved ; cells 1-3-seeded ; seeds subglobose, pale. DISTRIB.' Europe, 

 N. Africa, N. and W. Asia to the Himalaya ; introd. in the U. States. 

 Cult, as a salad. 



1O. DIPLOTAX'IS, DC. ROCKET. 



Annual or perennial herbs. Leaves pinnatind. Flowers yellow. Sepals 

 spreading, equal. Pod narrow, elongate, compressed ; valves 1-nerved ; 

 septum membranous ; style stout or slender, stigma simple. Seeds many, 

 sub-2-seriate, compressed ; cotyledons as in Brassica. DISTRIB. Temp. 

 Europe, Asia, and 1ST. Africa; species 20. ETYM. b*nr\6os and rais, from 

 the 2-seriate seeds. Differs from .Brassica in the flat pods, membranous 

 valves, minute compressed 2-seriate seeds, and the flowers varying to pink 

 or purplish, which is never the case in Brassica. 



1. D. mura'lis, DC. ; stem hispid leafy at the base, leaves sinuate or 

 pinnatind, scapes slender ascending, pods suberect linear. Sisym'brium, 



L. Bras' sica brevi'pes, Syme. 



