conifers. SILVA OF NORTH AMERICA. 33 



PINUS STROBIFORMIS. 



White Pine. 



Leaves in 5-leaved clusters, slender, from 3J to 4 inches in length. Cones from 

 5 to 9 inches long, their scales thin, renexed. 



Pinus strobiformis, Engelmann, Wislizenus Memoir of a ii. 406 (in part) (not Schlechtendal) (1868). — Hemsley, 



Tour to Northern Mexico {Senate Doc. 1848), Bot. Appx 

 102. — Carriere, Rev. Hort. 1854, 228 ; Fl. des Serres, ix 



201 ; Traite Conif. 309. — Gordon, Pinetum, 238. — Eep. vi. 258 (1878) 



Henkel & Hochstetter, Syn. Nadelh. 116. — Pringle, Gar 

 den and Forest, i. 430. — Sargent, Garden and Forest, ii 

 496. 

 Pinus Ayacahuite, Parlatore, De Candolle Prodr. xvi. pt. 



Bot. Biol. Am. Cent. iii. 186 (in part). 

 Pinus flexilis, y reflexa, Engelmann, Bothrock Wheeler's 



Pinus reflexa, Engelmann, Bot. Gazette, vii. 4 (1882) ; 

 Gard. Chron. n. ser. xvii. 260. — Sargent, Forest Trees 

 N. Am. 10th Census U. S. ix. 189 (excl. hab. New Mex- 

 ico). — Beissner, Handb. Nadelh. 275. 



A tree, from eighty to one hundred feet in height, with a trunk rarely more than two feet in 

 diameter, and short slender often somewhat pendulous branches forming a narrow pyramidal head. 

 The bark of the trunk is from an inch to an inch and a half in thickness, and is irregularly divided by 

 deep connected fissures into narrow rounded ridges covered by small loose reddish brown scales. The 

 branchlets are slender, and when they first appear are coated with short close rufous pubescence; 

 during their first winter they are light orange-brown and slightly puberulous, and in their third year 

 are purplish and sometimes coated with a glaucous bloom. The winter branch-buds are ovate, acute, 

 and about a third of an inch long, and are covered by ovate-lanceolate long-pointed thin pale chestnut- 

 brown scales scarious and erose on the margins. The leaves are borne in clusters of five, and during 

 the winter are inclosed in minute ovate compressed light green buds. The bud-scales lengthen with 

 the young leaves, and, increasing in length from without inward, are when fully grown oblong, acute 

 at the apex, thin, lustrous, and pale chestnut-brown, forming a rather close deciduous sheath from 

 three quarters of an inch to nearly an inch in length. The leaves are slender, rigid, from three and a 

 half to four inches long, sharply serrulate with minute remote teeth, especially toward the apex, or 

 often nearly entire, and pale green ; they are marked on the ventral faces with three or four rows of 

 stomata, and contain a large fibro-vascular bundle and two dorsal resin ducts ; 1 they begin to fall 

 during their third season, and have usually disappeared before the end of their fourth year. The 

 flowers open in Arizona at the very end of May. The staminate flowers are oval and a third of an 

 inch in length, with anthers terminating in erect erose crests, and are surrounded by eight bracts. The 

 pistillate flowers are subterminal and half an inch in length, with dark reddish purple slightly renexed 

 scales, and are raised on slender peduncles from one half to three quarters of an inch long, and clothed 

 with ovate-lanceolate light chestnut-brown bracts conspicuously keeled on the back and thin and erose 

 on the margins. At the end of their first season the young cones are erect on stout mostly naked 

 peduncles from three quarters of an inch to an inch and a half in length, and are from an inch to an 

 inch and a quarter long, half an inch broad, and light red-brown ; they grow rapidly the following 

 spring usually remaining erect until after the appearance of the flowers, and at maturity are pendulous, 

 from five to nine inches in length, about an inch and a half in breadth, and light green, with thin 

 smooth scales about an inch and a quarter long, often nearly an inch wide at the base of the exposed 

 portion, and narrowed and rounded at the much reflexed apex, which is tipped with a small rounded 

 slightly thickened umbo ; after the scales open their upper parts turn light brown slightly tinged with 



1 Coulter & Rose, Bot. Gazette, xi. 261. 



