PLATE 74. 
VOL. 1. 
MEMOIRS DEPARTMENT OF BOTANY . COLUMBIA COLLEGE, 
<= 3 
1 1 
' 1 
' 
oe) ih 
gt 
wae 
mt) 
\ ns 
=, a 
mee Wi \) 
a mK) 
Ny tg 
CROSS SECTION STEM OF POLYGONUM PENNSYLVANICUM LINNAEUS 
