BRANCHLET SYSTEM OF CYPRESSES 161 
sprays irregularly arranged and not in one plane, 
and of sprays arranged in one plane, which we will 
call attention to under the headings of branchlet 
systems. 
DIFFERENCES IN THE BRANCHLET SYSTEM, OR 
ARRANGEMENTS OF BRANCHLETS, OF THE CU- 
PRESSINEZ TRIBE 
This so-called branchlet system has nothing to do 
with what we have previously discussed, namely the 
shape of the ultimate branchlets. It has only 
reference to the way in which branchlets are placed 
on their parental stems, and the different way they 
grow out from them. 
One habit is what botanists allude to as being 
arranged ‘‘in one plane.’’ The other, or contrary 
habit, is simply expressed by negative form, and as 
*‘ not in one plane.” 
“‘ In one plane ”’ is an arrangement after the manner 
and plan of a common fern. ‘ Not in one plane ’’ is 
when the branchlets stick out radially from the 
parental stem, and from different points of situation 
of that stem ; or to put it in another way, when the 
branchlets jut out from the stem at different angles 
in a sort of radial method, as do the leaves of the 
Spruce. 
To take, for example, a spray of a Lawson Cypress, 
which is described as arranged “in one plane”’: if 
we pick a branchlet off and lay it upon a table, it 
should lie out flat, because its branchlets, like our 
human arms, are naturally situated in one plane and 
spread out evenly from only two sides of the branch. 
But if you take the leaf of “not in one plane” 
branchlet system, Cypress (e.g. the Macrocarpa, or 
Sempervirens), a branchlet similarly treated cannot 
rest flat on a table, because its branches, like the 
