80 Proceedings of the Royal Society of Edinburgh. [Sess. 



Lysimachia vulgaris, L. " I," Y., YI., YII. Restricted to a very few 



places regarding the lochs. 

 Anagallis tenella, Murr. V. On the shores of a very few lowland 



lochs, but seldom abundant (hg. 49). 



PLANTAGINACEiE. 



Littorella lacustris, L. i^L. uniflora, Aschers.). "I., II., III.," lY., Y.. 



YL, YII. Abundant everywhere {ante, fig. 67). 

 Plantago lanceolata, L. Often conspicuous by its abundance on the 



stony shores of lochs in agricultural districts, especially in Area Y. 



POLYGONACEiE. 



Rumex Hydrolapathum, Huds. Y. Scarce. The water-docks are very 

 seldom seen at the lakes under consideration. 



Polygonum amphibium, L. " I., II.," lY., Y., YI., YII. Aquatic and 

 terrestrial forms are frequently very abundant, but chiefly in low- 

 land places (figs. 47, 84, 91, 101, etc.). 



Polygonum Hydropiper, L. " I.," lY., Y., YI., YII. Chiefly about low- 

 land lochs ; common, but seldom in abundance. 



Polygonum Persicaria, L. YI., YII. Sometimes abundant on the shores 

 of lowland lochs. 



Polygonum aviculare, L. YI., YII. Sometimes this plant overgrows 

 the drier parts of the shores of lowland lochs. 



CERATOPHYLLACE^. 



Ceratophjdlum demersum, L. YII. Otterston Loch is the only record 

 for the waters under consideration, and it grows there in such extra- 

 ordinary abundance that in many places a boat can only be rowed 

 through it with difficulty. Its presence doubtless excludes many 

 plants that would otherwise thrive in that loch. 



AMENTIFERiE. 



Alnus glutinosa, Gcert. {—A. rotundifolia, Mill.). "I., II., III.," lY., 



Y., YI., YII. Frequent. 

 Betula glutinosa. Fries ( — B. tomentosa, Reith and Abel). "I., II. 



III.," lY., Y., YI., YII. Frequent. 

 Myrica Gale, L. " I.," lY., Y., YI. Frequent, sometimes 5 feet high in 



sheltered places (fig. 34). 

 SaHx aurita, L. " I., II., III.," lY., Y., YI., YII. Frequent. 



The above four species are the most dominant trees or shrubs that 



