63. POLYGONACE^. 333 



^/^.^//J.^^ 932. Polygonum viviparum, Linn. 



Area * * * * [5] * 7 [8] * 10 11 12 * * 15 16 17 18. 



South limit in Caernai'von, York. 



North limit in Shetland, Sutherland, ^^?2yA-^^ 



Estimate of provinces 8. Estimate of counties 20. 



Latitude 53 — 61. Highland type of distribution. 



A. A. regions. Superagi'arian — Superarctic zones. 



Descends to the coast level, in East Highlands. 



Ascends to 1300 yards, in the same province. 



Range of mean annual temperature 47 — 34. 



Native. Pascual, Ericetal. Frequent in the Highland 

 provinces, but remains unreported from the Isles of Orkney 

 and Hebrides. In England it occurs in Westmoreland, 

 Durham, York and Caernarvon ; also repoi-ted to have 

 been found in Lincoln (Martyn, in B. G.) and Worcester 

 (Mr. Lees, in Hastings' Illustrations), though these are 

 doubtless to be considered erroneous records. Occurs at 

 a very trifling elevation in Fifeshire ; and as it gi'ows one 

 mile south from the city of Aberdeen, it is there probably 

 at or near the coast level ; as is the case also in the neigh- 

 bourhood of Loch Enboll, in Sutherland. 



933. Polygonum amphibium, Linn. 



Area general. 



South limit in Coniwall, 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. 

 Agrarian region. Inferagrarian — Superagrarian zones. 



