Postelsia 209 
It is to be noted that no section is incom- 
plete internal agreement, even Hesperopeuce 
which is monotypic, varying in the position of 
the cones in different individuals. 
Tsuga and Pseudotsuga are both small and 
uniform groups of species, but 7’swga shows con- 
siderable variety in the vascular bundle of the 
leaf, and in Pseudotsuga the leaf insertion, 
which has long been considered a very important 
character taxonomically, varies greatly even in 
tiemcame species. so that m this respect, some 
specimens of Abies (Pseudotsuga) taxijolia agree 
with Tsuga, and others with Eu-A dies. 
Picea shows great variation in the shape and 
structure of the leaf, but is otherwise very un- 
iform, while Ew-Abies which hkewise has great 
variation in leaf form, shows also considerable 
varlation in the staminate flower, and in the 
relative length of the scales and bracts of the 
constant one, such as the terminal cones of 7swga with the terminal 
or axillary cones of some species of cea, is counted as one half 
agreement. When, however, some individuals of a species differ 
from others, as different individuals of Abzes mertenstana differ in 
the position of the cones, it is considered an occasional complete 
agreement, and is reckoned as o-1. 
