
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, ete. :— 
S*, N. W. of Bold Knob. 
B. lutea, Michx. f. Yr Ltow Birca. 
Rich moist woods. B*, occasional; Eagle Valley; glen 
above Crossman Pines; Bear Hill:— MM, occasional; large 
trees near Cascade; Flagg’s Walk; fine trees by a brook, N. 
of Pine Hill, near Forest St. 
B. populifolia, Ait. Waurre Birch. Gray Brircu. 
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: — S, oc- 
casional in open ground ; less frequent in swamps : — B B, fre- 
quent in wet ground and edges of pastures. 
B. papyrifera, Marsh. Paper Brrcw. Canoe Brirca. 
Rich woods and banks of streams. M, rare; edge of pool, 
N. W. of Cascade; one tree, W. edge of Cranberry Pool. 
ALNUS, Tourn. ALDER. 
A. incana, Willd. Sprecxitep ALtprer. Hoary ALDER. 
Borders of streams and swamps. JB, frequent; more com- 
mon about the meadows and bogs, at a low station, than higher 
up the slopes; will not persist long in shade: —S and BB*, 
common. 
A. serrulata, Willd. Smoorma ALpER. 
Borders of streams and swamps. B*, common:—M*, 
common on borders of ponds and meadows; along Pine Hill 
brook : — B B*, by the brook. 
CORYLUS, Tourn. HaAze.-novt. 
C. Americana, Walt. Witp Hazet-nvr. 
Open thickets and roadsides. B*, 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 



