26. HALORAGrACE/E. 381 



North limit in the Hebrides, Sutherland, 5: 



Estimate of provinces 18. Estimate of counties 82. 



Latitude 50 — ? British type of distribution. 



A. A. regions. Inferagrarian — Inferarctic zones. 



Descends to the coast level, in the Channel province. 



Ascends to 750 yards, or upwards, in the East Highlands. 



Range of mean annual temperature 51 — 39. 



Native. Lacustral and Inundatal. Thi& species, dis- 

 tinguished by its small fruit, may be equally common as 

 C. verna, and apparently is more of a mountain plant than 

 either of the allied species. On Ben Aulder, it might be 

 deemed within the midarctic zone ; and almost so in the 

 small loch above Glen Callater, which I reckoned to be 

 750 yards above the sea. C. pedunculata is frequently 

 misnamed C. autumnalis. The name of the former will 

 mislead ; the fruit being usually or always sessile on the 

 plants which grow in water. 



/V--/^^./^^ 



^. 



386. Calutriche autumnalis, Linn. 



Area [* 2 3 4 * 6] 7 [8 9 10] 11 [12 13 14] 15 16 [17 18j. 



South limit in Caenarvonshire and r 



North limit in ^^^ 4: ^^^^^/^ * 



Estimate of provinces ? Estimate of counties '. 



"^Latitude 53-^ Scottish type of distribution. 



Descends ? Ascends ? 



Range of mean annual temperature 48 — ? 



Natwe.^ Lacustral. The frequent mistake of applying 

 the name of this species to plants of C pedunculata, has 

 induced me to inclose all the provinces, excepting those 

 from which I have inspected specimens of C. autumnalis. 

 It is not improbable, however, that the area of the present 

 species may be found to include most of the provinces from 



