168 Rhodora [SEPTEMBER 
isolated localities but are quite absent from many closely adjacent 
alpine and subalpine areas in which the conditions of exposure, ex- 
tremes of temperature, and amount of precipitation are seemingly the 
same. Besides the three primary groups of plants which, south of the 
St. Lawrence, are confined each to a single mountain or to certain 
very definite mountains and cliffs, there are several secondary groups 
of alpine species which are found associated with the members of each 
of two of the primary groups but not the third; and a rather smaller 
group of species which show no apparent selection of alpine areas. 
That is to say, a few plants grow in equal abundance on Mt. Wash- 
ington, Katahdin, or Table-top (Group I) and on the tableland of 
Mi. Albert (Group III); others occur on the tableland of Mt. Albert 
(Group II1) and also on the cliffs of Smuggler’s Notch, or of the lower 
St. Lawrence, or on the northwestern abutments of Table-top Mt. 
(Group Il); while only a few species thrive in all these areas (Groups 
I, II, and III). These facts will perhaps be more clearly brought out 
by the following summary. 
TABLE II. 
SUMMARY OF THE KNOWN DISTRIBUTION SOUTH OF THE ST. 
LAWRENCE OF 258 ALPINE AND SUBALPINE PLANTS ABOVE 
ENUMERATED, SHOWING THE NUMBER OCCURRING IN THE VARIOUS 
Groups oF AREAS. 
| Group. | Species. | Per cent. 
/ | 
Confined to a e | se "4% 
single group II | 94 | 36.4 
Ill 21 | 8.15 
Tél 12 4.65 
Ta & IT 11 4:3 
Occurring on two ee - | — 
or more groups II & Ill 4 1.55 
Ta, II & III 2 0.8 
I, Ia, IT & II 12 4.65 
eee 
258 | 100.00 
