A Revision of the Genus Clematis of the United States. 129 
extending from central Colorado, at Middle Park, Clear Creek Canon 
(middle elevations), and in the Wahsatch and Uinta mountains of 
Utah, at 6,000 or 7,000 feet, to Fort Ellis, and the Yellowstone in 
Montana, at Snake River Valley. Teton mountains (11,000 feet), and 
Flat Head River Valley in Northern Idaho and Washington Territory, 
and perhaps extending along the same range of mountains, north into 
British America. 
No. 5. Clematis Scottii, Porter, is also a very local species, having 
been described from specimens collected at Soda Springs, 35 miles 
west of Canon city, and in Fremont county, Colorado. It has also 
been found in a few other localities in Colorado, by local collectors. 
No. 6. Clematis ochroleuca, Aiton, has quite a limited and scattered 
distribution. It is found in the south in the upper districts of 
Georgia, Carolina and Tennessee, through Virginia. (at Alexandria), 
and Pennsylvania to Staten Island, New York. It is also recorded in 
two isolated situations, Central Ohio, and in Arkansas. It is possible 
that the former identification is erroneous, and that the latter, given 
in Lesquereux’s Catalogue of Plants of Arkansas,* is what I have 
called the variety Fremontit. This variety is one having a very local 
distribution. It was first found by Fremont in one of his early expe- 
ditions, and all record lost of the locality. In late years, 1874, Mr. 
Lewis Watson discovered a locality for the form at Ellis, Kansas, and 
it has also been found in Cloud county, Kansas. Mr. Isaac Martin- 
dale has specimens collected in Missouri. These exhaust all the now 
known localities for the form. It is so closely related to the C. ochro- 
leuca, that I can see no reason for not regarding it as a variety, pro- 
duced by peculiar circumstances, of that species. The C. ochroleuca 
seems to be one of those species, which not being a dominant form, is 
dying out. It must at a former period of time have ranged over a 
more extensive region of country, as the Viorna and Virginiana do 
now, but we can not tell the causes of its disappearance. It might, 
however, have been a dominant species previous to the glacier epoch, 
and driven from its original home by the cold, has been able to main- 
tain itself only in a few places up to the present time. 
No. 7. C. Viorna, Linn.—This species, if taken with its varieties, in 
the significance here given it, covers a large portion of our country. 
The type is found only as far south as the upper districts of North 
Carolina (Statesville), Georgia and Alabama. Thence it ranges north 
* Geol. of Arkansas, 1860, p. 346. 
