338 24. ROSACEA. 



322. Getim rivale, Linn, yi*^ ^/^^^^./ -^^^^ 

 322,b. Geum hybridum, Jacq. ? 



Area, general. 



South limit in Devon, Hampshire, Sussex, ^.-ttc^. 



North limit in Orkney and West Inverness-shire. 



Estimate of provinces 18. Estimate of counties 70. 



Latitude 50 — 60. British type of distribution. 



A. A. regions. Inferagi-arian — Midarctic zones. 



Descends to the coast level, in the Channel proAdnce. 



Ascends to 900 or 950 yards, in the East Highlands. 



Range of mean annual temperature 50 — 37. 



Native. Sylvestral, Septal, &c. The distribution of 

 this species is nearly the opposite of that of G. urbanum ; 

 being a boreal plant which becomes scarce in the south of 

 England. In the Hampshire marshes, scarcely above the 

 level of the tides, it is almost a 'paludal;' while on the 

 mountains of Scotland, it becomes rupestral or ericetal and 

 uliginal. For the most part, however, shaded spots appear 

 those which are congenial. Although the area of this 

 species is somewhat wider, yet Geum m-banum is the com- 

 moner one, if we except the Highlands, and, perhaps, some 

 other mountainous tracts. As for G. intermediimi, it is 

 truly difficult to say whether it would be better to regard 

 this abnoi-mal fomi as a variety of rivale or of urbanum ; 

 some examples approximating to the one, some to the 

 other. My own idea is, that both species may sport into 

 varieties ; the varieties of the one gi-eatly resembling those "^ 

 of the other species. At any rate, the intermediate exam- 

 ples are not one fonn, but a series of forms ; the extremes 

 of which differ from each other more than they differ, 

 respectively, from the two species, into which they appa- 



