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118 Cincinnati Society of Natural History. — 
A REVISION OF THE GENUS CLEMATIS OF THE 
UNITED STATES; EMBRACING DESCRIPTIONS OF 
ALL THE SPECIES, THEIR SYSTEMATIC AR- 
RANGEMENT, GHOGRAPHICAL DISTRIBUTION, 
AND SYNONOMY. 
By JosrepH F. JamMgs. 
Custodian, Cincinnati Society of Natural History. 
[Read by title before the American Association for the advancement of Science, August, 
1882.] 
This Revision of the Genus Clematis, native to the United States, has 
been prepared as a contribution toward that great desideratum of all 
botanists, a Flora of the United States. 
In this monograph I have collected the descriptions of all the 
species of the United States, have given their geographical distribu- 
tion, and as full a synonomy as I have been able to get together. 
For this latter portion Lam indebted to Mr. Sereno. Watson’s Index 
to North American Botany. For information in regard to range of 
species, I am indebted to many correspondents; and for the examination 
of specimens, am under obligations to Mr. Isaac Martindale, of 
Camden; Dr. George Vasey, of the Agricultural Department at Wash- 
ington ; Mr. Parker, of the Philadelphia Academy, and Mr. Watson, of 
Cambridge. een, 
The Genus Clematis, Linn., forming the tribe Clematide of the 
Ranunculacee, contains about one hundred species. They are widely 
distributed over all the warm and temperate regions of the earth, 
but like the rest of the order, are rare or unknown in the low, hot, 
damp regions of Africa, Asia and America. The species delight most 
in dry elevated localities, and many of them are found in the moun- 
tains at elevations of from 6,000 to 10,000 feet above the sea. 
Clematis, Linn. 
‘““Involucre none, or resembling a calyx, and situated next to the 
flower. Sepals 4 (4-8), colored, in estivation valvate, or with the 
edges bent inwards. Petals none, or shorter than the sepals, An- 
thers linear, extrorse. Achenia terminated by long (mostly plumose or 
hairy) tails. Perennial, herbaceous or somewhat shrubby plants, 
mostly sarmentose, with opposite leaves, and fibrous roots.” (Torr. 
& Gray, Flora NeeAm, wolnp.e7)) 
