15. ARABIS, L.
1. A. thaliana, L. Native. British type. Area C, N, D. Range 1, 2.
Walls, rocks, and dry sandy ground, not uncommon, ascending in Teesdale to 500 yards on Falcon Clints, and in Coquetdale to porphyritic crags at Shillmoor.
2. A. hirsuta, R.Br. Native. Xerophilous. British type. Area C, N, D. Range 1, 2.
Not known upon any of the Cheviot crags in the Wooler neighbourhood, 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. Range 1.
Dry banks, rare. Warden near Hexham (R. Wigham). Hedge-bank between Corbridge and Anick Grange (F. Scott). Walls at Ovingham (F.). Stanley Burn near Wylam (R.B. Bowman, A.). Side of the high-road near Gainford (F.B.).
17. BARBAREA, R.Br.
1. B. vulgaris, R.Br. Native. British type. Area C, N, D. Range 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. praecox, R.Br. Alien.
An occasional weed. Hedge-bank between Wooler and Earl (Dr. Johnston). In Weardale by the road-side near Frosterley (B.).
