3 o WEST-AMERICAN 



docino, a few miles interior. First visited by Prof. 

 H. N. Bolander, 1866. 



HENDERSON'S PINE, Var. (b) Hendersoni, Lemmon. 



Larger trees, with cone-scales uniformly developed 

 (all slightly tubercled at the external base). Bark 

 of largest trees broken more or less into small square 

 checks, resembling white oak. Interior of western 

 Oregon and Washington. Some of the characters 

 first detected by Prof. L. F. Henderson. 



No. 13 Tamarack Pine P.Murrayana, Balf. 



Tall, slender trees in wet, sub-alpine swamps of the 

 Arizona, the Sierra and Cascade Mountains, north- 

 ward to Upper Yukon River; also in the Rocky 

 Mountains. Cones ovate-conical, 1J to 2J inches 

 long, uniform in length and scale development. Trees 

 attacked by insects and bark-eating birds, hence 

 usually discharging pitch or gum very abundantly. 

 Bark very thin, only one-fourth to one-half inch thick, 

 resembling that of eastern and Old-World Tama- 

 rack, hence the tree is often considered to be a true 

 Tamarack. Wood tough and light-colored. (Until 

 recently confounded with P. contorta, but clearly 

 distinct.) * 



Another small-cone pine, the "Jack Pine" P. Banks- 

 ianaSi native of the northern States and Canada, ap- 

 proaches the Northwest in the region of British Colum- 

 bia. It is a small tree, with its peculiar, small, persistent 



