THE SILVA OF COLORADO 
III. Woopy PLants oF BOULDER COUNTY 
By FRANCIS RAMALEY 
Introduction.—This paper is intended as a preliminary report on the 
trees, shrubs and vines of Boulder County. It is hoped that the general 
discussion which follows, as well as the annotated list, may be useful to 
students, botanists or others interested in woody plants. Since the 
character of the flora is about the same all along the eastern foothill 
region in Colorado north of the Palmer Lake divide, most of the facts 
stated here will be of more general application than if Boulder County 
were a region apart. 
Sources of material.—Collections for the University of Colorado her- 
barium were first made by Mr. J. I. McFarland in 1881." In 1895 
and 1896 Mr. F. Y. Moseley, at that time an assistant in the department 
of biology, collected some specimens at Long’s Peak and other alpine 
and sub-alpine stations. In the summer of 1900 and from time to time 
since then the author has made collections in various parts of the county. 
Most of the Boulder County plants now in the herbarium are of these 
collections. During 1906 and 1907 the writer was assisted by Mr. W. 
W. Robbins, a graduate of the University. The larger part of the author’s 
collections have been identified by Professor Aven Nelson of the Univer- 
sity of Wyoming without whose accurate determinations the publication ~ 
of this paper would be impossible at the present time. The valuable 
work of Dr. P. A. Rydberg? has been consulted constantly and specimens 
cited by him in Boulder County are noted in the following list, credit 
being given in each case. Dr. Robert T. Young, now of the University 
of North Dakota, but formerly a resident of Boulder, made collections 
in the county but I have not seen his plants.3 
x Mr. McFarland was a member of the first graduating class ot the University. 
2 Flora of Colorado, Bull. 100, Agr. Exp. Sta., Colo. Agr. Coll. 1906. 
3 Dr. Young has prepared a valuable paper on the ‘‘Forest Formations of Boulder County” just pub- 
lished in Botanical Gazette, Vol. XLIX, pp. 321-352. 1907. 
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