980 Proceedings of Royal Society of Edinburgh. [sess. 
Carex aquatilis, Wahl. I. In various forms, excluding the 
tall variety ; this is one of the most widely distributed and 
dominant plants. It covers considerable tracts of bog and 
shallow water at the peaty margin of lakes, most frequently 
on the shore side, behind C. rostrata, Stokes, which is a 
deeper water species. II. Less abundant. 
Carex flacca, Schreb. II. Fairly abundant on the shores. 
Carex flacca, Schrcb ., var. stictocarpa, Sm. III. Shore of 
L. Cran. 
Carex flava, L., var. argillacea, Town. III. Shore of 
L. Cran. 
Carex flava, L., var. minor, Town. I. Shores of mountain 
lochs. 
Carex flava, L., var. lepidocarpa, Tausch. I. Sandy shores 
of lowland lochs. 
Carex binervis, Sm. I. Peaty places about the shores of 
hill lochs. 
Carex filiformis, L. I. Abundant about the shores of peaty 
lochs, on the mountains between Glen Moriston and Glen 
Urquhart. 
Carex rostrata, Stokes. 1., II., III. Beyond doubt the most 
widely distributed and dominant plant in Areas I. and 
III. It occurs in water up to 18 ins. deep, always in 
advance of C. aquatilis, where the two are found together, 
which is very usual. By its large and rapid growth, a 
considerable amount of detritus is thrown down annually ; 
it is therefore a most important plant in converting shallow 
lochs and shallow places about large lakes into terra firma. 
The largest specimens I have seen were at exposed lochs 
2300 ft. above sea. 
Carex vesicaria, L. I. Similar in habit to C. rostrata, but 
requiring less water, and not so robust. Not nearly so 
common or abundant as rostrata. 
GRAMINEiE. 
Phalaris arundinacea, L. I. Abundant about L. Ness, 
especially so on Cherry Island ; scarce elsewhere. 
Phragmites communis, Trin. I., II., III. Generally distri- 
