. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 327 Contribution from the Forest Service HENRY S. GRAVES, Forester Washington, D. C. PROFESSIONAL PAPER February 19,1916 THE SPRUCE AND BALSAM FIR TREES OF THE ROCKY MOUNTAIN REGION By GEORGE B. SUDWORTH, Dendrologist CONTENTS Scope of the Bulletin 1 Generic Characteristics of Spruces . 2 Black Spruce Picea mariana (Mill.) B.,S., &P 3 White Spruce Picea canadensis (Mill.) B., S., & P 6 Engelmann Spruce Picea engel- manni Engelmann 10 Blue Spruce—"Colorad
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 327 Contribution from the Forest Service HENRY S. GRAVES, Forester Washington, D. C. PROFESSIONAL PAPER February 19,1916 THE SPRUCE AND BALSAM FIR TREES OF THE ROCKY MOUNTAIN REGION By GEORGE B. SUDWORTH, Dendrologist CONTENTS Scope of the Bulletin 1 Generic Characteristics of Spruces . 2 Black Spruce Picea mariana (Mill.) B.,S., &P 3 White Spruce Picea canadensis (Mill.) B., S., & P 6 Engelmann Spruce Picea engel- manni Engelmann 10 Blue Spruce—"Colorado Blue Spruce" Picea parryana (Andre) Gard- ners' Chronicle 14 Generic Characteristics of Balsam Firs. 17 Balsam Fir Abies balsamea (Linn.) Miller 20 Page Generic Characteristics of Balsam Firs- continued Alpine Fir Abies lasiocarpa (Hook.) Nuttall 24 Cork Fir Abies arizonica Merriam 27 Grand Fir—"White Fir" Abies grandis Lindley 29 White Fir Abies concolor (Gord.) Parry 33 Shasta Red Fir Abies magnified shastensis Lemmon 38 Key to Genera 42 Key to Picea 42 Key to Abies 43. WASHINGTON GOVERNMENT PRINTING OFFICE 1916. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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