NORTHUMBERLAKD AND DCKHAM. 127 



15. ARABIS, L. 



1. A. thalia7ia, L. Native. British type. Area C, N, D. 



Eange 1, 2. 



"Walls, rocks, and dry sandy ground, not uncommon, ascending 

 in Teesdale to 500 yards on Falcon Glints, and in Coquetdale to 

 porphyritic crags at Shillmoor. 



2. A. hirsuta, E. Br. Native. Xerophilous. British type. 



Area 0, N, D. Eange 1, 2. 



Not known upon any of the Cheviot crags in the Wooler neigh- 

 bourhood, but occurring on the porphyry about Alwinton, and 

 frequent on the basalt and Mountain and Magnesian Limestone 

 from the Aln to the Tees, ascending in Harwood Dale to 550 

 yards. 



16. TURRITIS, L. . 



1. T. glabra, L. Native. Germanic type. Area N, D. 

 Eange 1. 



Dry banks, rare. Warden near Hexham (E. "Wigham). Hedge- 

 bank between Corbridge and Anick Grange (F. Scott). Walls at 

 Ovingham (F.). Stanley Bum near Wylam (E. B. Bowman, A.). 

 Side of the high-road near Gainford (F. B.). 



17. BARB AREA, R. Br. 



1. B. vulgaris, 'Si. Br. Native. British type. Area C, N, D, 



Eange 1. 



Common in damp places and by the side of streams, ascending 

 in Weardale to Frosterley (200 yards). The Northumbrian plant 

 which has been referred to B. arcuata, gathered by Mr. Borrer 

 near Alnwick, differs from the type by its subpatent pods and 

 less developed lateral leaf-lobes. 



2. B. precox, E. Br. Alien. 



An occasional weed. Hedge-bank between Wooler and Earl 

 (Dr. Johnston). In Weardale by the road-side near Frosterley 

 (B.). 



