210 Bios tetlsita 
cone. Indeed there is considerably more varia- 
tion within Fu-Abies than between Pseudotsuga 
and the more closely related species of Eu-A bies. 
Hes peropeuce stands almost intermediate be- 
tween Picea and Tsuga, and similarly Pseudo- 
tsuga stands between Tsuga and Abies, but the 
artificiality of uniting Hesperopeuce and Pseudo- 
isuga \with Tsuga, as was done by Eichler in 
Engler and Prantl’s Pflanzenfamilien, is seen 
when the two former sections are compared 
with one another. ‘There are scarcely two more 
unlike sections in the entire genus. 
The section Keteleeria, embracing one or 
more peculiar Chinese trees, stands also in many 
respects intermediate between Abzes and Tsuga, 
but it differs from all the other sections in its 
peculiar staminate inflorescence. 
Although the general relationship of the 
sections seems best expressed by the arrange- 
ment adopted in the body of this article, with 
Picea at one extreme and Fu-Abies at the other. 
there are several peculiar points to be noted. 
Thus in the form of the pollen grains, T’suga 
and Pseudotsuga stand together as contrasted 
