342 63. POLYGONACE^. 



943. RuMEx Hydrolapathum, Huds. ^^'^y 



Area 123456789 10 11*** [15] 16. 



South limit in Cornwall, Isle of Wight, Kent. 



North "limit in Aigyle (Tslay), Durham. 



Estimate of provinces 13. Estimate of counties 40. 



Latitude 50 — '56. English type of distribution. 



Agrarian region. Inferagrarian — Midagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards in England. 



Range of mean annual temperature 52 — 48. 



Native. Paludal. In most of the English counties, but 

 very scarce in Scotland. Possibly the estimate of 50 

 might be as near the truth as that of 40 counties. Locali- 

 ties have been recorded in Aberdeen and Perth, on autho- 

 rity which leaves it probable that R. aquaticus was the 

 species really observed. Mr. Gardiner (Flo. Forf.) thinks 

 this species introduced to the Links, near Barrie, Forfar- 

 shire ; but was not some other species, as R. alpinus, there 

 mistaken for the present one 1 Its occurrence in Islay is 

 verified by a specimen in my herbarium, collected in that 

 isle by Professor Balfour, by whose botanical excursions 

 in the west of Scotland this work has been very materially 

 assisted. I made a memorandum, but unluckily omitted 

 and have forgotten the authority, to the effect that Ru- 

 mex maximus of Schreber has been found at Lewes, in 

 Sussex. 



