CBUCIFER^. 



51 



respects the northern M. Radical leaves 

 in a small spreading tuft, pinnatelylobed, 

 and hispid with stiff hairs. Stems about 

 6 inches high, erect, and nearly simple, 

 with very few small leaves narrowed at 

 the base. Petals narrow and erect. Pods 

 erect, about an inch long. 



The Continental distribution of this 

 species is uncertain, as the name is often 

 given to plants quite different from ours ; 

 but it appears to be a native of lime- 

 stone rocks in the mountains of western 

 Europe. In Britain, only on St. Yin- 

 cent's Rocks, near Bristol, where it is 

 getting very scarce, and it will probably soon have to be expunged 

 from our Floras. Fl. spring. 



7. Northern Rockcress. Arabis petrsea, Lam. (Fig. Gl.) 

 (Cardamine hastulata. Eng. Bot. t. 469.) 



A small perennial, in some respects 

 intermediate between Rockcress and 

 Bittercress. Stems branched at the 

 base, loosely tufted, or shortly diffuse, 

 or almost creeping, but seldom above 6 

 inches long. Radical and lower leaves 

 obovate or oblong, and stalked, mostly 

 pinnately divided, with the terminal lobe 

 largest, or some of them nearly entire ; 

 the upper leaves few, narrow, almost 

 entire, tapering at the base. Flowers 

 few, considerably larger than in the 

 hairy R., white, or slightly purplish. 

 Pods spreading, rather more than half 

 an inch long, the seeds apparently in 

 single rows. 



In the mountains of northern Europe, 

 and in the higher ranges of central Europe, extending all across Rus- 

 sian Asia. In Britain, frequent on the higher mountains of northern 

 and western Scotland, and has been found also in Cumberland and 

 North Wales. FL summer. 



VI. BITTERCRESS. CARDAMINE. 



Herbs, either annual or with a perennial rootstock, glabrous, or bear- 



