200 
On these characters the following division of the tribe could 
be made: 
Division I. 
Hermaphrodite florets sterile, style entire, except in Polymnia, 
with a truncate appendage of brush hairs, or linear obtuse with 
brush hairs covering the whole surface. This division includes 
the genera: Szlphium, Polymnia, Berlandiera, Iva and Xan- 
thium. 
Division II. 
-Hermaphrodite flowers fertile, with a two-branched style. 
The branches havea triangular tip, the brush hairs cover the 
outer surface of the branch, and extend down a part or the entire 
distance to the base, occurring also on the inner surface at the 
very tip. The papilla cover the entire inner face or occur in 
two very wide lines. This division includes the genera: Helian- 
thus, Tetragonotheca, Eclipta, Echinacea, Rudbeckia, Lepachys, 
Lorrichia, Actinomeris, Coreopsis, Bidens, Baldwinia and Galin- 
soga. 
Division I. 
Silphium® (Plate CXIX, Fig. 1-5). 
S. perfoliatum, L. Style of the hermaphrodite sterile flowers 
entire, cylindrical, obtuse. Brush hairs cover the entire surface 
for about three-fourths of its length (Fig. 4). They are large, 
broad at the base, and with an acute point (Fig. 5). Style 
branches of the pistillate flowers longand acute. Stigmatic pap- 
ill cover the entire inner surface (Figs. 1, 2). The papille 
(Fig. 3) are short and obtuse. 
Polymnia® (Fig. 6). 
P. Canadensis, L. Sterile style is two cleft. The branches 
are entirely covered with brush hairs, which are very short and 
broad (Fig. 6). 
Lerlandiera (Fig. 7). 
B. subcaulis, Nutt. The branches of the pistillate flowers 
are smaller than in Sz/phium, and the papille are in two wide 
61. Hildebrand, |. c., p. 29. 
