306 88. PTERIDIOIDES. 



. 1424. Equisetum palustre, 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. Inferagi'arian — Midarctic zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 850 yards, in East Hignlands. 



Range of mean annual temperature 52 — 38. 



Native. Paludal. A variable j)lant; the small and 

 slightly branched states of which, both alpine and sub- 

 littoral, are not distinguished from E. variegatum without 

 difficulty sometimes in determining to which sjiecies the 

 individual examples should be referred. 



1425. Equisetum limosum, Liim. 

 1425, b. Equisetum fluviatile, Newm. 



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, m East Highlands. 

 Range of mean annual temperature 52 — 39. 



