258 baker's north YORKSHIRE. 



western hills it is not unfrequent. It ascends to the Peak of 

 Great Whernside and the Main Limestone of Mickle Fell, and, 

 like Myrrhis, descends with the streams into the central valley. 

 So that it has, in fact, a widely diffused 'Montane' superadded 

 to a 'Maritime' role of distribution.- C. anglica and C. danica 

 I do not know as growing within our limits. 



Armoracia rusticana Baumg. Alien. Commonly grown 

 in gardens and occasionally subspontaneous in waste ground. 

 It is well established by the side of Codbeck, between Dalton 

 and Topcliffe Bridge. 



Draba muralis L. Intermediate type. Native. Xero- 

 philous. Area 9. Range 300-400. Limestone rocks, Sleight- 

 holme Beck, near Bowes, 1876 ; y! P. SoiUter. 



Draba incana L. Highland type. Native. Montane. Sub- 

 xerophilous. Area 987. Range 350-800. Frequent amongst the 

 calcareous scars of the western dales. In the West Tees district 

 on Cronkley Scars, the Sugar Limestone of Cronkley Fell, the Main 

 Limestone of Mickle Fell and Gilmanscar. In the West Swale 

 district plentiful on the scars of Booze Moor and both upon the 

 northern and western slope of Kisdon. Hell Gill. In the Yore 

 district upon the chffs of Widdale Fell, Stag's Fell, Addlebrough, 

 Semmerdale, Waldendale, etc. 



Draba verna L. British type. Native. Area general. 

 Range 0-800. Common upon walls and dry banks, ascending 

 to the Main Limestone of Askrigg Moor and Mickle Fell. The 

 common plant of North Yorkshire is Erophila majuscula 

 Jordan ! D. prcecox Stev., E. brachycarpa Jordan ! grows upon 

 walls of calcareous gritstone at Scawton and Rievaulx, and is 

 not unfrequent on limestone rocks in Upper Wensleydale ; 

 J. Percival ; and a plant closely allied to the Breadalbane 

 D. inflata ! upon walls in the Vale of Mowbray at Westow. 



Camelina sativa Crantz. Alien. Not unfrequent as a 

 casual weed in cultivated fields, especially of flax. The 

 common plant of North Yorkshire is true C. sativa, but C. 

 dentata Pers. also occurs. 



