ENUMERATION OF CONIFERS 



311 



exudation, a character by which this species is easily distinguished from other 

 shrubby pines. 



Subgenus II. DIPLOXYLON. PITCH PINES 



Bracts of leaf-fascicles dccurrent: sheaths persistent, rarely deciduous: 

 leaves serrulate, with two fibro-vascular bundles and with dorsal and ventral 

 stomata: cones with dorsal umbo: wood hard, with dark resinous bands and 

 clearly defined annual rings: spring-shoots often multinodal (producing 

 more than one whorl of branclilets) . 



Section III. Parapinaster 



Sheaths of leaf-fascicles persistent or deciduous: seed-wing adnata or 

 articulate and short. (The two Mexican species with deciduous sheaths 

 forming the group Leiophyllae are not in cultivation.) 



Group 7. LONGIFOLI^ 



<jrrOUp /. LrONGIFOLI^ 



Leaves in fascicles of 3, very long; sheaths persistent: seed -wing adnate 

 the nut. 



to the 



17, P. longifolia, Roxbg. (P. Roxburghii, Sarg.). 

 Tree to 100 feet tall or more, with round-topped 

 symmetrical head; bark thick, deeply fissured into 

 large plates; branclilets light yellow-brown; winter- 

 buds oblong, light chestnut-brown, not resinous, 

 with fringed not recurved scales: leaves 3, slender, 

 pendulous, light green, 8-12 inches long: cones short- 

 stalked, conic-ovoid, 4-7 inches long; apophysis elon- 

 gated-pyramidal, compressed, more or less recurved; 

 umbo obtuse; seed ^-1 inch long. Himalayas from 

 Bhutan to Afghanistan on the outer slopes and foot- 

 hills. — Introduced in 1801 to Great Britain. Culti- 

 vated in California and not hardy north of the 

 Southern States. As a young plant it is very orna- 

 mental with its long, drooping, light green leaves. In 

 its native country it is an important forest tree. 



18. P. canariensis, C. Smith. Canary P. Fig. 82. 

 Tree to 80 feet tall, with slender branches forming 

 a broad round-topped head; stem and branches 

 usually with scattered, short, leaf y branclilets ; bark 

 reddish, slightlj' fissured into irregular scales; 

 branclilets yellowish, pruinose when young; winter- 

 buds oblong, not resinous, with reflexed conspicu- 



Pinus canariensis. 



