30 GBUVUmue. [BRASSICA. 



decumbent. Radical leaves with short broad toothed segments. Flmrers 

 ^-j in. diam., pale yellow. Pods 1^-2^ in., spreading ; beak thick ; seeds 

 globose dark, punctate. DlSTKlB. Shores of W. and S. Europe and N. 

 Africa. 



Sub-sp. MONEN'siS proper, glabrous, stem nearly simple, leaves chiefly radical. 

 S. Wales to Skye ; inland at Merthyr Tydfil, S. Wales. 



Sub-sp. CHEIRAN'THOS, VUlars (sp.); hispid, stem branched leafy. St. 

 Aubyn's Bay, Jersey, Alderney. 



SECTION 2. Sina'pis, L. (Gen. ) Sepals spreading 



* Pods erect, apprised to the stem ; valves \-nerved ; cells few-seeded. 



4. B. ni'gra, Boiss. ; stem-leaves petioled linear-lanceolate entire or 

 toothed glabrous, pods subulate 4-angled glabrous, beak short seedless. 

 Black Mustard. 



Hedges and waste places, common as an escape, wild on sea-cliffs (Syme) ; 

 rare in Scotland ; a doubtful native in S. of Ireland ; a native ? Watto* ; 

 fl. June-Sept. Annual. Stem 2-3 ft., rigid, blanched, more or less hispid. 

 Leaves 4-8 in., lower lyrate, terminal lobe much the longest. Flnn-i ,-.< 

 $-J in. diam., bright yellow. Pod -% in., subulate, beak slender, valves 

 keeled, torulose ; pedicels 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 



r'te entire hispid, pods subcylindric, beak clavate ribbed as long as 

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



Sandy fields, Jersey and Alderney ; fl. July-Aug. Habit of B. nigra, but 

 more branched ; pod very short (^ in.) ; valves linear ; beak 8-ribbed ; seeds 

 fewer, flattened. DISTRIB. Europe, from Belgium southwards. 



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



6. B. Sinapls'trum, Boiss.; hispid, upper leaves toothed or lymtc, 

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

 beak. Sina'pis arven'sis, L. Charlock. 



Cornfields, ascending to 1,200 ft. ; a colonist or likely a native, Watson; fl. 

 May-A ug. Annual. Stem 1-2 ft. , usually branched. Le <* lyrate-pinna- 

 tifid, toothed. Flowers ^-j{ in. diam., subcorymbose, bright yellow. Pods 

 1J-2 in.; pedicels slender, spreading; valves torulose; beak deciduous, 

 straight, almost rigid, as broad as the hispid valves ; seeds subcompressed, 

 dark brown. DISTRIB. Europe, N. Africa, N. and W. Asia to the Hima- 

 laya ; introd. in America. 



7. B. alba, Boiss.; hispid with reflexed hairs, upper leaves pinnatifid, 

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

 1-seeded beak. Sina.pis, L. White Mustard. 



Cultivated ground, &c. from Mid. Scotland southwards; Mid. Ireland rare; a 

 colonist, Walton; fl. June-July. Annual. Stem 1-3 ft., erect, furrowed, 

 branches ascending. Leaves all lyrate-pinnatifid or pinnate ; segments cut 

 and lobed. Flowers J in diam., yellow. Pods 2 in., hispid ; valves 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. Cultivated as a salad. 



