ee ee Me 
TE Se eT OEE oe etn ae RE ee ee ee 
NS OT ee eee SP ae ee ey 
MoperNnN ASTER 19 
and its culmination for Aster appearing in the work of Willdenow, 
1804, in Pursh’s Flora, 1814, and in Nees’ “‘ Synopsis,” 1818. 
V. The Segregation period, distinguished by the separation 
from Aster of numerous small sections as independent genera ; 
ushered in by Cassini, 1818, etc., extended by Lessing, 1832, and 
speedily culminating in Nees’ “ Genera et Species Asterearum,”’ 
1832; followed by DeCandolle’s Asver in the fifth volume of his 
Prodromus, 1836, and by Rafinesque in America, also in 1836. 
Partial reuniting followed in America at the hands of Torrey and 
Gray in their Flora of North America, 1841, and was maintained 
by Gray in his Synoptical Flora, 1884. A renewed impulse to 
segregation has latterly assumed strength, as manifested by E. L. 
Greene in his Pittonia, 1896, etc., and by Britton and Brown, 
Illustrated Flora, 1898. 
