EQUISETUM ARVENSE. 
365 
Thames. — Hertfordshire. Middlesex. Kent. Surrey. Ox- 
fordshire. Berkshire. Essex. 
Ouse. — Suffolk. Norfolk. Cambridgeshire. Bedfordshire. 
Huntingdonshire. Northamptonshire. 
Severn. — Warwickshire. Gloucestershire. Herefordshire. 
Worcestershire. Staffordshire. Shropshire. 
S. Wales. — Glamorganshire. Pembrokeshire. Carmarthenshire. 
N. Wales. — Anglesea. Denbighshire. Flintshire. 
Trent. — Leicestershire. Rutland. Lincolnshire. Nottingham- 
shire. Derbyshire. 
Mersey. — Lancashire. Cheshire. 
Humber. — Yorkshire. 
Tyne. — Durham. Northumberland. Isle of Man. 
Lakes. — Gosforth, Cumberland, «/. Robson. 
W. Lowlands. — Dumfries-shire. Kirkcudbrightshire. Lanark- 
shire. 
E. Lowlands. — ^Berwickshire. Haddingtonshire. Edinburgh- 
shire. Linlithgowshire. 
E. Highlands. — Stirlingshire. Clackmannanshire. Kinross- 
shire. Fifeshire. Perthshire. Forfarshire. Kincardine- 
shire. Aberdeenshire. Morayshire. 
W. Highlands. — Argyleshire. Dumbartonshire. Isles of Islay 
and Cantyre. 
N. Highlands. — Ross-shire. Sutherlandshire. Caithness. 
N, Isles. — Orkney, T. Anderson, Shetland. 
W. Isles. — Roddal, Harris. 
