266 BAKETi'S NORTH YORKSHIRE. 



ThoTpe Arch. In the Central Valley at Bedale, Kirklington, 

 Acomb, and Sowerby. Old wall at Acomb ; W. Whitwell. 

 On the east in many places amongst the calcareous hills and 

 Howardian tract, also on sandstone walls at Coxwold, New- 

 burgh, and Upsal Castle. 



Turritis glabra L. Germanic type. Native. Area 8 . 2. 

 Range o-ioo. Sandy fields in the Central Valley in several 

 places. Catterick Bridge, Brompton-on-Swale, Kirklington, 

 Leeming Lane, Leckby, Helperby, Skipton Bridge, Carlton 

 Miniott, etc. 



Barbarea vulgaris R.Br. British type. Native. Area 

 general. Range 0-300. Common in watery places in the low 

 country, ascending to Cotherstone and Hawes. B. arcuata 

 occurs occasionally, and a form which might easily be mistaken 

 for the following, and which is probably the var. sylvestris of 

 Fries, grows along with it on Clifton Ings. 



Barbarea stricta Fries. English type. Native. Area 6.1. 

 Range o-ioo. With the preceding about the Ouse along Clifton 

 Ings and in other places in the neighbourhood of York, where 

 it was discovered by Mr. Borrer. Reported by Mr. Simpson 

 from Leeming Lane, but I have not seen specimens. A species 

 widely diffused upon the continent, but singularly local in Britain. 



Barbarea intermedia Boreau ! Intermediate type. Colonist. 

 Area 3 2. Range 0-150. Has occurred in cultivated fields near 

 Thirsk in several places; W. Foggitt. I met with this in 1862, 

 in cultivated fields at the lower end of Bilsdale, on the slope of 

 Easterside towards Hawnby. 



Barbarea praecox R.Br. Alien. Casually subspontaneous 

 in waste ground. Richmond, Wensley, Camphill, Welburn, etc. 

 Railway embankment at Thirsk ; W. Foggitt. 



Nasturtium officinale R.Br. British type. Native. Area 

 general. Range 0-350. Common in ditches and slow streams, 

 ascending to the moor above Preston-under-Scar. 



Nasturtium terrestre R. Br. English type. Native. Area 

 98765.321. Range o-ioo. Damp places, not unfrequent 



