with him in part, at least regarding the status of certain 
species such as Cinchona Calisaya Weddell which he has 
met with in his travels in southern Peru. Indeed, the 
writer cannot but feel that a great deal of careful taxo- 
nomic work was accomplished by cinchona botanists of 
the past centuries and especially by such men as Ruiz 
& Pavonand Weddell who had become well acquainted 
with the species in the field. 
In the pages that follow, the writer initiates a critical 
discussion of some poorly known Peruvian cinchonas in 
the light of his observations in the field. The species 
treated in this paper are easily recognizable because of 
the rather dense covering of hairs found on the leaves 
and young growth. Our knowledge of these species, up 
to now, has been based for the most part on the most 
meagre and fragmentary of herbarium material; in fact, 
certain of them are known only from types collected 
more than a century ago. Inasmuch as the existing de- 
scriptions of these plants are either incomplete or based 
only on the original collection, the writer includes modi- 
fied descriptions based on a study of recent collections. 
Besides his own collection (WHH), the first set of 
which is deposited in the herbarium of the United States 
National Arboretum (USN A), the writer has examined 
specimens of cinchonas in the following institutions, to 
whose curators he is indebted for kindnesses received 
during the study: Chicago Museum (F), Gray Herbar- 
ium (G), University of Massachusetts (M), New York 
Botanical Garden (N Y), Museo Historia Natural ‘‘Javier 
Prado”’ of Lima (L), the United States National Her- 
barium (US), and the herbarium of the Estacién A gri- 
cola de Tingo Maria in Pert (TM). 
CINCHONA CARABAYENSIS Weddell 
The identity of this cinchona has remained uncertain, 
[139 ] 
