26 



4. CRUCIFER.E. 



1. Sisymbrium officin- 

 ale, L. Hedge Mvstord. Erect. 

 downy annual; brandies rigid, 

 spreading horizontally ; leaves 

 stalked, the lower ones rnncinate, 

 the upper hastate ; flowers small, 

 pale-yellow ; pods short, awl- 

 shaped, almost sessile, appressed, 

 valves 3-nerved ; seeds light- 

 brown, obliquely truncate. 



Koadsides and cultivated land. 

 — Sept.-Dec. — Europe; western 

 Asia. 



2. S. orientaie, L. Oriental 

 Bocket. Erect, villous annual or 

 biennial; leaves stalked, lyrate or 

 rnncinate, the middle ones with 

 a terminal lobe, which is very 

 long and hastate, all the lobes 

 with small, spreading or erect 

 auricles on the lower side of the 

 base ; the uppermost leaves lan- 

 ceolate 



Sisymbrium offlcinaie. 



Sisymbrium orientate. 



Boak shorter than pcid 

 Boak lona^er than pod 



entire; flowers small, 

 pale-yellow, sometimes exceeded 

 by the young pods below them ; 

 pods long, very slender, curved, 

 on short pedicels almost as thick 

 as the pod, ascending or spread- 

 ing, valves 3-nerved : seeds ob- 

 long. »S'. Colli III iio\ Jacq. 



Roadsides and waste places. — 

 July-Nov. — Central and southern 

 Europe. 



6. SiNAPIS, L. 



(From sinapi. the Greek name 

 for mustard.) 

 Sepals spreading, equal at 

 base ; pod subcylindrical with 

 a conical beak; seeds in 1 row, 

 with a biting flavour ; flowers 

 yellow ; cotyledons of Diplo- 

 taxis. 



S. 

 S. 



arrcnsis 

 alha 2 



1 



1. Sinapis arvensis, L. Charlock, Wild Mus- 

 tard. Dull-green, rough-villous annual; stem erect with 



