PINUS BALFOURIANA. 



313 



places. Younger trees in vigorous health are also growing in the 

 grounds of Col. Bowdler at Camberley in Surrey ; at Batsford, near 

 Stratford-oii-Avon ; at Castlewellan, Co. Down, Ireland; and in the 

 Royal Botanic Gardens at Glasnevin. All these afford evidence of its 

 adaptability for the British climate under certain conditions, and as it is 

 one of the most graceful of Pines for the decoration of the lawn, it may 

 be planted for that . purpose where the situation is well sheltered. 



Closely allied to Pinus Ayacakuite and apparently only a geographical 

 modification of it is the White Pine of southern Arizona, figured and 

 described in Professor- Sargent's " Silva of North America," XI. 33, 

 tt. 544, 545, from which the following particulars are taken. 



Pinus strobiformis. 



Engelmann in Bot. Append. 102 toWislizenus, "Tour in Northern Mexico." Carriere 

 in Van Houtte's Flore des Serres, IX. 201. P. reflexa, Engelmann in Bot. Gaz. VII. 4. 



Pinus strobiformis is sparingly scattered over the rocky ridges of 

 the Santa Rita, Chiricahua and other mountains of southern Arizona 

 at elevations of from 6,000 to 8,000 feet. It was discovered by 

 Dr. Wislizenus, in Chihuahua in northern Mexico, in 1846. It differs 

 from P. Ayacaliuite chiefly in its smaller dimensions, due to the drier 

 climate of the region it inhabits ; also in its short, slender, often 

 pendulous branchlets and in its smaller cones. 



Pinus Balfouriana. 



" A tree usually 30 40 feet in height with a short trunk 1 2 feet 

 in diameter, but occasionally much higher with a tall, straight, tapering 

 stem 5 feet in diameter; at high elevations 

 reduced to a low shrub with gnarled semi- 

 prostrate stems." Bark of young trees thin, white, 

 smooth ; of old trees thicker, red-brown and 

 much fissured. Branches short, stout, and 

 spreading horizontally or upturned at the apical 

 end ; in old age irregular in length and 

 direction, and often contorted. Branchlets in 

 whorls of three five, stoutish, covered with 

 reddish brown, obliquely furrowed bark that is 

 almost concealed by the close-set foliage. Buds 

 ovoid-conic, acute, 0*5 0'75 inch long, with 

 narrowly lanceolate, acuminate pale chestnut-brown 

 perulse often coated with pale limpid resin. 

 Leaves quinate, persistent several years, crowded, 

 incurved, and pressed against the branchlets, 

 triquetral, with entire margins, 1 1*5 inch long, 

 dark green 011 the outer convex side, marked 

 with silver-grey stomatiferous lines on the two 

 inner faces ; basal sheath about one-eighth of 

 an inch long, and soon falling off. Staminate 

 flowers ellipsoid, about 0'5 inch long, in short 

 crowded spikes, with orange-brown anthers and 



Fig.* 9i. Branchiet reduced and surrounded at the base by five ovate, acute, 

 ' BaifmirianL PinUS involucral bracts. Cones sub-erect or horizontal, 



