206 
entire outer face as far down as the base of the branches and 
sometimes farther. The papillz are in two lines or cover the en- 
tire inner face. 
Cnicus (Fig. 17-18). 
C. altissimus, var. discolor (Muhl.), Gray. The style 
branches are very long cylindrical with a slight acute tip. The 
brush hairs cover the entire outer face as far down as the base of 
the branches, ending just below the base of the branches in a tuft 
of somewhat longer hairs (Fig. 17). The papillae are in two 
moderately wide lines on the inner face, and extend the whole 
length of the branch. The brush hairs (fig. 18) are rather short 
and acute. 
Centaurea (Fig. 19-21). 
C. Americana, Nutt. Branches of the style are very short 
aud obtuse. Brush hairs cover the entire outer face of the 
branches, and extend below the forks for about one-third of the 
entire length of the style (fig. 19-20). The papilla occupy the 
entire inner face of the branches. Brush hairs (fig. 21) are longer 
than in Cuzcus and are acuminate. 
CICHORIACEA (Plate CXX, fig. 22-23). 
In this tribe only one genus was examined, viz: 
Taraxacum (Fig. 22-23). 
T. officinale, Weber. Branches of the style are moderately 
long and terete. Brush hairs cover the entire outer face, and 
edges and tip of the inner face of the branches. They extend 
below the fork for about the length of the branches, and cover the 
style completely. The style is slightly enlarged below the fork. 
The papillz occupy the entire inner face not covered with brush 
hairs (fig. 23). 
| CoNCLUSION. 
From these observations I would say in conclusion that, while 
there is not enough uniformity in the characters of the style, with- 
in the various tribes, to absolutely separate the different tribes in 
all cases, yet in most cases there is uniformity enough to aid 
greatly in classification. As has been pointed out by Bentham 
- and Gray, it is impossible to rely upon a single absolute charac- 
ter for the whole order, 
