202 
Letragonotheca (Fig. 16, 17). 
I. Ludoviciana (T. & G.), Gray. The branches of the style 
have a very slender tip. The brush hairs cover the outer face 
along the upper two-thirds of the branch. The longest hairs 
occur where the branches begin to taper. The papillz are in two 
lines along the edges of the inner face and are of about average 
size (Fig. 17). The brush hairs (Fig. 16) are larger than those 
of any other genus studied. 
Lclipta (Fig. 18). 
£. alva (L.), Hassk. The style has the same general structure 
as in Helianthus, but it was so small that the exact form was bard 
to determine. The papille (fig. 18) are short and obtuse. 
Echinacea (Fig. 19-20). 
£. angustifolia, DC. Branches of the style long and taper- 
ing. The brush hairs occupy a little more than one-half of the 
branch, covering the outer face and the tip of the inner. The 
longest hairs occur just below the tip, (fig. 19). The papille 
cover the entire inner surface and are of average size, (fig. 20). 
Rudbeckia (Fig. 21-22). 
R. subtomentosa, Pursh. The branches are like those of 
Helianthus except they do not taper so much. The long and 
slender brush hairs cover the outer face of the branches for their 
. whole length, (fig. 21). The papille, (fig. 22) cover the entire 
inner face. bépackys (Fie 393 -24). 
£. pinnata (Vent.), Torr. & Gray. Style branches a little 
shorter than in Helianthus, very slender, tapering above the end 
of the stigmatic lines. Brush hairs cover not only the outer face 
for nearly its entire length, but also the inner face above the end 
of the stigmatic lines. As compared with Rudbeckia the hairs are 
short and broad, (fig. 23). The papille are in two lines on the 
inner face for about one-half the length of the branch. They are 
very short and obtuse, (fig. 24). 
Borrichia (Fig. (25-26). 
B. arborescens (L.), DC. The branches are slender and 
about one and a half times as long as in Helianthus. The brush 
