Handbook of Trees of the Noktiief.n Statks axd Canada. 



Tlic Yellow Pi IK' of the Itocky Mountain 

 region is usiuillv ;i incMlinm si/.c t rcu of frum 

 5(1-70 ft. in hri-lil willi ti'iiiik from \-'l ft. 

 in diameter, hut w here (.-ondit imis are |>ar- 

 ticuhirly faxoralilr attains the hei^dit of IhO 

 to 12.") ft., with trunk ;i-4 ft. in (liametcr. The 

 bark of the younger trunks is ihirk and hs- 

 sured into rather hrm scaly rid^i^es hut these 

 flake oir ^\■ith a^^e ami the bark of i.dd truidvs 

 is mure uf a eiiinamoii-reil eidm- and hrokeii 

 into large sealy [dates. ]t develops a distinet 

 pyramidal head at first and hy the gradual 

 lengthening of tin- lateral hranehes finally a, 

 briiad roumled top. Tt oeeupies \v(dl-drained 

 uplands anil mimntain slopes, hein,^ partieu- 

 larly ahnndant in the lilaek Hills of ])akota. in 

 northwestern Xi-hraska ami on the mountains 

 of Colorado at aUit\ides ranging fi'om six to 

 ted thousand feet. On the ('( dorado plateau 

 of northern Arizona, and Xe\\' .Mexico it forms 

 vast and valuahle forests. 



Its peeuliarity in having leaves both in 

 (dusters of two and three is ('xceptional to the 

 usual hahil of tlie Vines. 



'I'lie wood is rather hard, liemw and strong 



and useful for lundier for gi-neral eonstrne- 



tion ])uri)oses, interior finishing, eti-. 



fjcarrs both in elnsters of i* and :'.. .'1-0 in. hm'^, 

 ri';-id. with sheaths at first close and ;il)out Vj in. 

 lung l)ut finally luesc and slntrlrr, slnmaliferous 

 all "sides and eonlainin^ _ lil)r<i-\ ascnlar bundles 

 and 1^-.". resin duels within the luireuehynia. 

 l-';nirrrs: sinininale nliotu 1 in. \i'n\x. Fruit: 

 eniies '2-4 in. Ihiil;, -iveifl. de.adnons above the 

 lowest hasal scnies. smnewlinr (.Ijliijue with seales 

 thiekened ri |- ■.\\\rK nnd e(i\'ere(l willi sbaider 

 strongly re<*nr\'e(| pi'ickles : sei'{l i, iu. long with 

 ample wing brnadesl in the eeuler. 



1. Syn. /'. S<<ii>:ilnnni> l.em. 



