Annals 
of the 
Missouri Botanical Garden 
——=——д—— ЕВСЕН 
———_ 
я 
Vor. I SEPTEMBER, 1914 No. 8 
DESCRIPTIONS OF NORTH AMERICAN SENECIONE/E: 
J. M. GREENMAN 
Curator of the Herbarium of the Missouri Botanical Garden 
Associate Professor in the Henry Shaw School of Botany of 
Washington University 
The following descriptions and notes are the results obtained 
from a critical study of material in several herbaria during the 
preparation of a monograph of the North American species of 
the genus Senecio. Some of the species here described have 
been in manuscript a number of years and a few of them have 
been withheld from publication, because of incomplete speci- 
mens, hoping that additional material might be brought together 
before publication. In many cases supplementary and sub- 
stantiating material has been obtained from which it is now 
possible to make fairly complete diagnoses. In one or two 
instances a reconsideration of certain natural groups within the 
genus, in the light of recent collections, has made it possible to 
combine forms which formerly were taken to represent distinct 
species. Very few new species have resulted from recent col- 
lections, but there are still many regions, particularly in Central 
America, which are inadequately explored. Тһе writer would 
welcome material in this genus from any part of North America 
in order that the geographical range of species may be recorded 
as accurately as possible in his forthcoming monograph. Тһе 
sections indieated in parentheses immediately following the 
generic name are in accordance with my preliminary paper to 
which reference is made under the species. 
! Issued September 30, 1914. 
Амм. Мо. Вот. GARD., Vor. 1, 1914 (263) 
