26. HALORAGIACEiE. 379 



/yj^ ///■/ 382. Myriophyllum alterniflorum, De C. 



Area 12 3|5||89 ^^''^^13 14 1.5^/* 18. 



South limit in Cornwall, Tsle of Wight, i 



^6/$5t/._^ North limit in the Hebrides, t 



A. 



Estimate of provinces 18. Estimate of counties 81. 



Latitude 50 — 59.^ Inferagrarian — Superagrarian zones, h^^^^ ^A^ 



Descends to the coast level, in the Peninsula, i^'^'^t^^^ '^■ 



Ascends to 350 yards, in the East Highlands. A^ ^ ^■ 



Range of mean annual temperature 51 — 43. 



Native. Lacustral. Having only been lately distin- 

 guished from the other two species, the distribution of this 

 present one can be yet shown very incompletely. It is 

 likely that all the provincial vacancies will be filled up, as 

 the result of longer observation, and that this species will 

 eventually be found the most frequent and widely distri- 

 buted of the three. 



383. Callitriche verna, 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 — Inferarctic zones. 

 Descends to the coast level, in the Peninsula. 

 Ascends to 650 yards, in the East Highlands. 

 Range of mean annual temperature 52 — 40. 

 Native. Lacustral and Inundatal. Thus indicated, the 

 distribution of C. verna may be understood to comprehend 



i/j*. , 



