FURTHER OBSERVATIONS ON THE EASTERN ACAU- 
LESCENT VIOLETS: 
CHARLES LOU TS. POLLARo 
In a paper published two years ago in the Proceedings of the 
Biological Society of Washington,” I presented a tentative revis- 
ion of the purple-flowered, stemless violets found in the north- 
eastern United States. Since that time I have been engaged in 
field study of the genus in New Jersey, Pennsylvania, the District 
of Columbia, and Virginia, a territory from which the larger 
proportion of early types was obtained. The excellent library 
of Professor E. L. Greene, of the Catholic University, has been 
kindly placed at my disposal, and the opportunity thus afforded 
of studying the unpublished colored drawings of Le Conte, 
illustrative of the latter’s well-known monograph of the genus, 
has been of great value in clearing up doubtful determinations. 
The herbarium of the Philadelphia Academy of Sciences, con- 
taining specimens ticketed by Nuttall, Schweinitz, and Darling- 
ton, has also afforded material assistance. Many friends and 
correspondents, to whom I am deeply indebted, have aided me 
with living and dried plants. 
In the paper above referred to nine species and one variety 
were enumerated among the purple-flowered, acaulescent class. 
As a result of subsequent study this number must be increased 
at least twofold, and Professor Greene’s investigations have 
shown that the violets of Canada and the Great Lake region are 
as yet but imperfectly understood. Mr. Macoun’s observations 
during the past season, communicated to Professor Greene, have 
enriched the genus by five species, all natives of Canada; and 
I doubt not that similar results would follow an exploration of 
the southern portions of British Columbia. 
* Published by permission of the Secretary of the Smithsonian Institution. 
*10: 85-92. 1896. 
1898 ] 325 
