32 
not im the description of either. In B. populifolia we find that 
the leaves are [.5-2.5% long, orvin other: words: B. papyrifera has 
leaves normally about twice as long as B. populifolia but wi 
wider range in length, but when we come to examine the figures 
of the leaves we find that B. populifolia has leaves about a half. 
longer than B. papyrifera,. now which is right the figure or the 
description? We find the petioles channeled ini B. populifolia and 
nothing: said about it in the other. The male catkins of B: populi- 
folia are 2-3’ long, and in B.. papyriferay 2-4’ long,.a distinction 
with scarcely a difference. The pistillate catkins of B. populi- 
folia and B. papyrifera are cylindrical-and this character’therefore 
belongs in the key and not here, they are: both:slender-peduncled 
also,, which belongs in the key: In B. papyrifera the fertile cat- 
kins are described as spreading or drooping and figured as ap- 
pressed and erect, nothing said about it in the other, but figured 
as ascending and spreading. In B. populifolia they are described’ 
as 9-18” long, 3-5” wide, and in B. papyrifera.as 1-2’ long and 
M4-yat wide. We see a use of different denominations in meas- 
urement which is always bad, it should have been.in the one 9-12” 
long, and the other 12-24” long, 3-5” wide, and 3-6” wide, this 
kind of juggling with figures implies.a difference when there is 
none worth mention, When we come to examine the figures we~ 
find B. papyrifera has catkins about twice as wide as the other 
lobes divergent, larger than the middle one. Those ‘of B. papyri- 
acter'as shown by the figures is not mentioned: in the text. at all, 
serted beyond the-others:. We find that:the body of the nut is nar-- 
rower than-its* wings inxboth species, a character that does. not 
belong in the-description’of either. 
