20 INTRODUCTION. 



near Torquay, and on Brean Down, a rocky penin- 

 sula of the Severn Sea, near Weston-super-mare, 

 Somerset. Garex liumilis occurs here as well as 

 on St. Vincent's rocks. 



Helianthemum Breweri, on Holyhead Mountain, An- 

 glesea, and near Amlwch, in the same island. 



Diantlius ccesius, the " Cheddar Pink," found only on 

 the singular precipitous rocks of Cheddar, Somer- 

 setshire. 



Cucubalus baccifems, in the Isle of Dogs, opposite 

 Greenwich. ]^o other English locality is known. 

 Discovered there by Mr. GEOEGE LUXTOED, in 

 1837. 



Alsine stricta, on Teesdale Moors, near Widdy-bank 

 Pell, its only known locality in Britain, found there 

 by Mr. J. BACKHOUSE, jun. and party, in 1844. 

 Teesdale, and especially the portion of it compre- 

 hended by Widdy-bank Fell, Cauldron Snout, and 

 Falcon Glints, is a district peculiarly rich in botan- 

 ical rarities.* Cauldron Snout is a cataract on the 

 river Tees, where the stream plunges in a broken 

 fall of about 200ft. down a dark basaltic gorge. 

 Over the Snout is a narrow bridge, connecting the 

 counties of Durham and "Westmoreland. Falcon 

 Glints is a range of lofty basaltic crags, which 

 commence here and extend along the river a mile 

 and a half. The very local Woodsia ilvensis grows 

 in the fissures of the basalt. In the tract called 

 Widdy Bank various other rare plants are localized, 

 as Bartsia alpina, Gentiana verna, Cnicus lietero- 

 phyllus, Sedum villosum, Tqfieldia palustris, Saxifraga 



* See BACKHOUSE'S Botanical Ramble in Yorkshire, Phytologist, Sept., 

 1844. 



