72 



METROPOLITAN PARK FLORA. 



tops, then branches out and forms a spreading canopy over 

 them: — M*, occasional on dry slopes and ledges; fine trees 

 along Owen's and Flagg's Walks ; slope of Bear Hill, etc. : — 

 S*, N. W. of Bold Knob. 

 B. lutea, Michx. f. Yellow Birch. 



Rich moist woods. B*, occasional; Eagle Valley; glen 

 above Crossman Pines; Bear Hill: — M, occasional; large 

 trees near Cascade ; Flagg's Walk ; fine trees by a brook, N. 

 of Pine Hill, near Forest St. 

 B. populifoiia, Ait. White Birch. Gray Birch. 



Dry barren soil, and borders of swamps. B and M*, com- 

 mon everywhere in open ground from the bleak hill-top to the 

 wet swamp ; young trees are easily killed by fire, but sprout 

 readily ; it is soon shaded out by overtopping trees : — 8, oc- 

 casional in open ground ; less frequent in swamps : — BB, fre- 

 quent in wet ground and edges of pastures. 



B. papyrifera, Marsh. Paper Birch. Canoe Birch. 

 Rich woods and banks of streams. If, rare ; edge of pool, 



N. W. of Cascade ; one tree, W. edge of Cranberry Pool. 



ALNUS, Touru. Alder. 

 A. incana, Willd. Speckled Alder. Hoary Alder. 



Borders of streams and swamps. _B, frequent ; more com- 

 mon about the meadows and bogs, at a low station, than higher 

 up the slopes; will not persist long in shade : — SaadBB*, 

 common. 

 A. serruJata, Willd. Smooth Alder. 



Borders of streams and swamps. B*, common: — M*, 

 common on borders of ponds and meadows ; along Pine Hill 

 brook : — BB*, by the brook. 



CORYLUS, Tourn. Hazel-nbt. 



C. Americana, Walt. Wild Hazel-nut. 



Open thickets and roadsides. B m , frequent; usually found 

 in dry places in open land ; recovers quickly after a fire, but 

 spreads slowly ; will not persist permanently in shade ; W. of 



