402 71. AMENTIFER^. 



1021. Salix arbuscula, Linn. 



Area ^^^^^^jfju^^^^^lS^lolO* 18. 



South limit in Dumfries, Perth, Forfar. 



North limit in Orkney, Aberdeen, Argyle. 



Estimate of provinces 4. Estimate of counties 6. 



Latitude 55 — 60. Highland type of distribution. 



Arctic region. Inferarctic — Midarctic zones. 



Descends to 500 yards, less or more, in E. Highlands. 



Ascends to 800 yards, more or less, in same province. 



Range of mean annual temperature, say 45 — 41. 



Native. Rupestral. Possibly descends within the su- 

 peragrarian zone ; and if really to be found in Orkney, it 

 will there be below 500 yards. 



1022. Salix Lapponum, Linn. 

 1022*. Salix glauca, Sm. 



Area ***** [6 * 8] * -* 11 * * 14 15 16 17 18. 



South limit in Durham, Edinburgh, Stirling. 



North limit in Orkney, Sutherland, Ross. 



Estimate of provinces 6. Estimate of counties 12. 



Latitude 54 — 60. Highland type of distribution. 



A. A. regions. Superagrarian — Midarctic zones. 



Descends to 200 yards, or lower, in East Lowlands. 



Ascends to 850 yards, in East Highlands. 



Range of mean annual temperature 46 — 39. 



Native. Rupestral. Has been reported to grow in 

 South Wales and Nottinghamshire ; both of which may 

 likely be erroneous records. There appears less doubt 

 about the county of Durham, in the province of Tyne; be- 

 cause a specimen from Teesdale was shown to Mr. Winch 



