DISTRIBUTION OF PLANTS IN BKITAIN. 705 



8. Trent — Leicester, Butland, Lincoln, Notts, Derby. 



9. Mersey — Cheshire, Lancashire. 



10. Humher — York. 



11. Tyne— Durham, Northumberland. 



12. Lakes — Westmoreland, Cumberland (Isle of Man). 



13. West Lowlands — Dumfries, Kirkcudbright, Wigton, Ayr, Lanark, Eenfrew. 



14. East Lowlands— Berwick, Roxburgh, Peebles, Selkirk, Haddington, Edin- 



burgh, Linlithgow. 



15. East Highlands — Fife, Kinross, Clackmannan, Stirling, 'Perth, Forfar, Kin- 



cardine, Aberdeen, Banff, Moray (including Nairn, Elgin, and the north- 

 east of Inverness). 



16. West Highlands — Dumbarton, Argyle, Inyemess, westward of Loch Ericht, 



Isles adjacent from Arran to Skye. 



17. North Highlands — Boss and Cromarty, Sutherland, Caithness. 



18. North Isles — Hebrides, Orkney, Shetland. 



Under these are included 38 sub-provinces, of which 18 are in 

 South Britain, 10 in Mid-Britain, and 10 in North Britain. 



As Mr. Watson does not include Ireland nor the Channel Islands 

 in his work on the Distrihition of British I'lants, the following 

 remarks on the Floras of these divisions of the kingdom are added : — 



The Flora of Ireland has .been specially reported on by Dr. D. 

 Moore and Mr. A. Gr. More in their Cybele Hibemica. The mean 

 annual temperature of Ireland is 50° Fahr. The mean summer tem- 

 perature is 2° lower than that of Great Britain, while the mean winter 

 temperature is 2° higher. The Flora is remarkable for the occurrence 

 of plants characteristic of the west and south of Europe, a list of 

 which is given in noticing Forbes's Pyrenean Flora (p. 708). Besides 

 these there are plants which point to a former connection with North 

 America, such as 



Spiranthes gemmipara (Roman- 



zoviana). 

 Naias flexiUs. 



Sisyrinchium anceps. 

 Eriocaulon septangulare. 



Of plants belonging to Watson's Atlantic type, the following may 

 be given as examples : — 



Matthiola sinuata. 

 Cotyledon Umbilicus. 

 Crithmum maritimum. 

 Rubia peregrina. 

 Pinguicula lusitanica. 

 Euphorbia Paralias. 



Euphorbia portlandica. 

 Alisma natans. 

 Soirpus Savii. 

 Bhynchospora fusca. 

 Asplenium lanceolatum. 

 Adiautum Capillus-veneris. 



Of Watson's Germanic type tjiere are few representatives. Among 

 them are ; — 



Turritis glabra. 

 Lythrum hyssopifolia. 

 Monotropa Hypopitys. 



Cynoglossum jnontanum. 

 Orchis i^yramidalis. 

 Stratiotes aloides. 



The mountains in Ireland reach about 3400 feet above the level 



2 Z 



