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mountainous tract separates the New River from the plain on the 
east. This region when more thoroughly explored in the future 
will doubtless yield fine results. 
About four miles northwest of Marion, on the opposite side of 
the valley of the middle fork of the Holston River, the Alleghanies 
take their rise. Beyond a more or less interrupted outlying ridge, 
at some places rising to 3,000 feet, Walker Mountain is situated, 
its highest altitude being 3,800 feet. Gradually shading out into 
the irregular talley of the north fork of the Holston, the land rises 
into more lofty and rugged mountains, prominent among which 
are the peak-like summits of White Rock, Red Rock, etc. The 
Alleghanies extend westward for many miles, finally ending with 
the Powell River valley, whence the most westerly mountain 
range rises—the Cumberland. This, although much lower than 
the two eastern ranges, spreads over a large area, and consists of 
almost innumerable small ridges, which fade out little by little 
into the plains of Kentucky and the neighboring States. 
In consequence of such diversified conditions, it is natural that 
the flora of the whole district is more or less affected and locally 
distributed. The botany of our excursion is recorded in the fol- 
lowing annotated list of the plants collected : 
Clematis Addisonii, Britton. Roanoke, alt. 1,000 ft. 
The locality discovered in 1890* was again visited and found 
to have been nearly obliterated by the quarrying down of the hill 
in the process of building ‘new streets, so that where hundreds of 
plants were seen before not more than a couple of dozen were 
noticed.f 
t Clematis ovata, Pursh. Fl. Am. Sept. ii. 737 (1814). Kate's Mt. 
Greenbriar Co., W. Va., alt. 3,300 ft. 
For the first time, as far as is known, this rare Clematis has 
been collected in flower at the same place where Dr. Britton found 
it in fruit in 1890, and it proves to be a good species. 
* Mem, Torr. Club, ii. 28. 
+In the Gattinger Herbarium of the University of Tennessee, at Knoxville, 
there is a specimen of this species preserved, collected by Mrs. Bennett, in 1888, in 
the Cumberland Mountains, Tenn.—N. L. B. 
tMem. Torr. Club, ii. 28, 
