71. AMENTIFER.E. 399 



1016. Salix ambigua, Ehrh. 



Area * 2 3 4 ****** 11 * * * 15 16 17 18. 



South limit in Sussex, Essex, Suffolk. 



North limit in Orkney, Caithness, Isle of Staffa. 



Estimate of provinces 8. Estimate of counties 10. 



Latitude 50 — 60. Local (Brit.) type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, or nearly so, in England. 



Ascends to 400 yards, or upwards, in East Highlands. 



Range of mean annual temperature 49 — 43. 



Native. Ericetal. This is quite unknown to me ; and 

 I am thus compelled to sketch out the distribution very 

 unsatisfactorily from the slight mention of counties for the 

 species by Mr. Borrer, in the Supplement to English 

 Botany, with some additions from Winch and Gardiner, 

 who can scarcely be deemed very safe authorities for the 

 species of a genus so difficult and perplexing as the one 

 now under notice. 



1017. Salix fdsca, Linn. 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 

 North limit in Shetland, Orkney, Hebrides. 

 Estimate of provinces 18. Estimate of counties 82. 

 Latitude 50 — 61. British type of distribution. 

 A. A. regions. Inferagrarian — Inferarctic zones. 

 Descends to the coast level, in the Peninsula. 

 Ascends to 700 yards, in East Highlands. 

 Range of mean annual temperature 52 — 40. 



