BULLETIN No. 460 y 
Contribution from the Forest Service. 
HENRY S. GRAVES, Forester. 
Washington, D.C. PROFESSIONAL PAPER May 26, 1917 
THE PINE TREES OF THE ROCKY MOUNTAIN 
REGION. 
CONTENTS. 
Page. | Page. 
Bconpeor DUllebine: sees Sols a Oo 1 | Generic characteristics of pines—Contd. 
Generic characteristics of pines --..--......-- 2 Bristle-cone pine (Pinus aristata Engel- 
Wau ey Ont apes SAS Ae ae a aap ee ee 4 TEVA) Mase ise Ae ea CU rat a ae 23 
Western white pine (Pinus monticola Wellowapinest says ean nia vias ei lel ies 26 
AD) OUIESTAS) peti eee i te e eae 4 Arizona pine (Pinus arizonica Engel- 
Limber pine (Pinus flevilis James)... ..-. 7 AMM EUTNINS) yee rs) Se OUR OU a Nae Tall le 26 
White-bark pine (Pinus albicaulis Engel- Western yellow pine (Pinus ponderosa 
RETA TOIT) payee eee ios Seni ere eee aR ame My 9 TA WSOM)) 80s Meier Beate Aa Use ein a 28 
Mexican white pine (Pinus strobiformis Apache pine; ‘‘ Arizona longleaf pine’’ 
MAC CLM ANT) Hemese see, ae 12 (Pinus apacheca Lemmon).......-..... 33 
Mexican pifion (Pinus cembroides Zucca- Chihuahua pine (Pinus chihuahuana 
TRATI) eeeccsa tated ais cove ApS NPN Mee SMe. 5 15 lsnater eben nanny cease Dunne ss ame eet eye ay 36 
Pifion; nut pine (Pinus edulis Engel- Lodgepole pine (Pinus contorta Loudon). 38 
THULE BAY) SAS NS a gS a Da a 18 Jack pine (Pinus banksiana Lambert)... 42 
Single-leaf pine (Pinus monophylla Tor- ica COS Peles Matte sey Ses Rae Na twomicatc aele 46 
meygand Mremont) se. seen oe 21 
SCOPE OF THE BULLETIN. 
In this bulletin are described and figured the distinguishing char- 
acteristics of all of the pine trees that inhabit the Rocky Mountain | 
region. Graphic illustrations of the range of these trees and dis- 
cussions of their forest habits are also included. The exact limits 
of the Rocky Mountain territory covered by this publication are 
F given in Bulletin No. 207: of the Forest Service, to which the 
reader is referred. Other statements made there regarding the gen- 
eral plan of treating the subject, sources of information, and acknowl- 
edgments of assistance? received apply to the present bulletin. The 
i“ The Cypress and Juniper Trees of the Rocky Mountain Region, 1915. 
Grateful acknowledgment is here made to Dr. H. N. Whitford for valuable notes on 
the range of Pinus manticola and P. albicaulis in British Columbia. 
61354°— Bull. 460—17—-—1 
