U/2 
FIFTEENTH REPORT. 
some plants like Potentilla fruticosa, Salix Candida and Betula pumila 
are spreading, others like Pyrola, which was once frequent in the 
tamarack swamp, is no longer seen, while the flowering season of some 
lias beeu retarded, and other plants have been dwarfed. The floral con- 
ditions here are of such interest that it seems desirable to place on 
record as complete a list as possible of the flora before it has become 
radically changed or partially exterminated. The list is by no means 
complete as collecting was begun late in May and during August I 
was away on my annual vacation. 
The valley may be divided into two natural areas. The Wooded Area 
and The Cleared Area. 
The Wooded Area may be sub-divided into the Upland Series, The 
Lowland Series and The Bottomland or Flood Plain Series. 
The Cleared Area may be sub-divided into the Edaphic Series and 
the Aquatic Series. 
The Edaphic Series may be again sub-divided into the Upland Pas- 
tures, The Tamarack Swamp, The Mud or Reed Swamp and the Marl 
Bed. 
THE UPLAND SERIES. 
The range of hills has been, for the most part, cleared of its forest 
growth, so that the series is but poorlv represented. 
June Oth, 1912. 
< 'a rex Pennsylvanica. 
Wa 1 dstein i a fra ga ri o i des. 
June 23rd. 
( ’arpinus ( 'aroiiniana. 
Also on lowland and plain. 
Ostrya Virginiana. 
Rhus Canadensis. 
June 30th. 
Amelanchier florida. 
Amelanchier sanguinea. 
July 28th. 
Equisetum arvense. 
Also on the plain. 
Festuca nutans. 
Monotropa uni flora. 
October 27th. 
1 *opulus grandidentata. 
Cory lus Americana. 
Also on the plain. 
Quercus alba. 
Also on the lowlands. 
Quercus ellipsoidalis. 
Quercus velutina. 
Euosmus Sassafras. 
( Tataegus opulans. 
Rhus glabra. 
Rhus hirta, Var. typhina. 
Tilia Americana. 
Also on the plain. 
