172 THE FKESH- WATER LOCHS OF SCOTLAND 
Generally very abundant, but it usually seems to require 
water that is more or less peaty. In lowland non-peaty lochs 
that receive the drainage of villages M. spicatum takes its 
place. It is very exceptional to find the* two species in the 
same water. 
Myriophyllum spicatum, L., II., V., VI., VII. Abundant where 
the water is not peaty ; see remarks on the preceding species. 
CALLITRICHACEiE 
Callitriche vernalis, Koch, VI., VII. Not common, but sometimes 
occurs in sheltered bays or in shore pools. 
Callitriche stagnalis. Scop., I., III., IV., V., VI., VII. Terrestrial and 
aquatic forms are rather common in shallow places and pools 
about the shores of non-peaty lochs. 
Callitriche hamulata, Xiitz., I., III., IV., V., VI., VII. W^idely dis- 
tributed in peaty water, and particularly abundant in Area I., 
where it occurs in almost every loch, and is frequently a 
dominant species. It is usually found without the floating 
rosettes ; but in a few places — Loch Stroan, for example — the 
two forms occur. 
Callitriche autumnalis, L., V., VI., VIL This fine species is 
widely distributed in non-peaty lowland lochs, and it is 
frequently very abundant and even dominant. 
PORTULACE^ 
Montia fontana, L. Aquatic form, syn. M. rivularis, Gemel., I., 
II., v., VI., VII. A very common plant about the shores of 
some of the less peaty lochs, both in aquatic and terrestrial 
forms. 
SAXIFRAGACE^ 
Parnassia palustris, L., I., II., IV., [V., VI., J. M'A.], VIL 
Occasionally represented on boggy shores. 
UMBELLIFER^ 
Hydrocotyle vulgaris, L., L, IL, IIL, IV., V., VI., VIL The 
ordinary form abounds nearlv everywhere on the shores of 
lochs. At Barlockhart Loch there occurred a floating form 
. having stems from 30 to 50 inches long, and leaves only 
about half an inch in diameter. 
Apium nodiflorum, Reichb., V., VIL Scarce, seldom seen as a con- 
stituent of a loch flora. 
Apium inundatum, Reichh., I., IV., V., VI., VIL Sometimes very 
abundant, but always in water that is not very peaty. It 
