CRUCIFEBOUS TRIBE. 



41 



notch of the pouch ; seeds numerous ; stem-leaves arrow- 

 shaped at the base ; stem simple. Mountainous lime- 

 stone pastures in the north of England; rare. Fl. 

 June, July. Perennial. 



THLASPI ARV^NS^ (Penny Cress). 



2. CAPSELLA (Shepherd's Purse). 



I. C. Bursa Pastoris (Common Shepherd's Purse). 

 The only species. A common weed, to be found in 



