VEGETABLE IRRITANTS. 71 



SINAPIS ALBA {British). 



WHITE MUSTARD.— SALAD MUSTARD.— CHARLOCK. 



CrucifercE. — Leaves pinnatifid. — Pods bristly, rugged, spread- 

 ing, shorter than the beak. — Waste ground, ift. Ann. July. 

 Yellow. 



Toxic principle.— OW, OF MUSTARD. 



SINAPIS NIGRA {British). 



BLACK MUS TARD. — BROWN MUSTARD. — GROCER'S MUSTARD. 



Cruciferca. — Lower leaves lyrate, rough ; upper ones linear- 

 lanceolate. — Beak of pod very short. — Pungent seeds used as a 

 condiment. — 3-4ft. Ann. June. Yellow. 



Toxic principle— GVL OF MUSTARD. 



