516 BOTANICAL GAZETTE [JUNE 
This would be expected, since it is further removed from the outlet 
and is adjacent to the hill at the north, from which it has received 
considerable wash material. 
Scattered throughout the sedge moor, and particularly in the 
upper half mentioned, are numerous clumps of vegetation. These 
are slightly elevated above the general level and vary from 1 to 3 ft. 
in diameter. The nucleus of a clump is usually a Salix chlorophylla 
shrub. This species is an early invader of sedge moor throughout 
the Park. Building in and around it are such early invaders as 
Sedum rhodanthum, Alsine longifolia (Muhl.) Brit., Arabis hirsuta 
Scop., Cerastium occidentale Greene, Geum strictum Ait., and 
Dasiophora fruticosa. The clumps may also originate about a 
W Viv WW 
Herbaceous-meadow Meadow-scrub wijlow- 
thicket 
Carex var. Carex ut : 
parganiu 
| SU anaes 
Batrachium 
Fic. 14.—Ideal section at west shore of Park Lake 
Dastophora shrub or Deschampsia tuft. All the shrubs are young. 
Ring counts of Dasiophora show the large majority to be 13-15 
years of age. Salix shrubs are older on the average. The sedge 
moor is rapidly being converted into meadow. 
At the northwest shore of Filled Lake there is a shallow shelf 
extending outward from the shore line. The limits of this shelf 
were determined by making soil borings. These were simply used 
as a check on the determination of its limits by the vegetative 
covering. In fact, the presence of the shelf here was called to the 
attention by a rather marked difference in the vegetation as con- 
trasted with that beyond. It is mentioned simply to illustrate 
transition conditions between sedge moor and meadow. Here 
Deschampsia caespitosa is predominant. Young Dasiophora shrubs 
are very uniformly distributed throughout. Sedges, relatively, are 
not an important component. Secondary species are: Hierochloa 
odorata (L.) R. and S., Phleum alpinum L., Poa leptocoma, Cerastium 
occidentale, Alsine longifolia, Caltha rotundifolia (Huth.) Greene., 
Sedum rhodanthum, Geum strictum, Potentilla gracilis, Valeriana 
