White Pine 



7 



Cones conic, much incurved; northern tree. ' 

 Spines of the cone-scales well developed. 

 Cones 4 to 7 cm. long. 



Twigs not glaucous; leaves slender, i mm. thick. 

 Twigs glaucous; leaves stout, 1.5 to 2 mm. thick. 

 Cones 10 to 13 cm. long, globose or depressed; scales 

 with hooked spines. 

 Western tree; cone-scales with short incurved spines. 



32. P. Banksiami. > 



33. P. cldKsa. 



34. /'. virginiana, 



35. P. pungciis. 



36. /'. Diiiiicata. 



I. WHITE PINE Pinus Strobus Linnaus 



The White pine, or Weymouth pine, is the most valuable forest tree of eastern 

 North America, and one of the most beautiful of conifers. It occurs from New- 

 foundland to Ontario and Manitoba, south, near the Atlantic coast to east-central 

 New Jersey, along the Alleghany INIountains to Georgia and eastern Tennessee, 

 and to Illinois and Iowa. It prefers the moist loose soil of hillsides and mountain 

 slopes, occasionally, however, growing in quite swampy situations. The tree 

 attains a maximum height of about 80 meters, with a trunk sometimes 2 meters ( 

 in diameter. 



Tlie bark of old trees is verv thick and fissured, that of voung trees much 

 thinner, smooth, or nearly so, green or red- 

 dish. The young twigs are somewhat vel- 

 vety, but soon become smooth and brown. 

 The buds are pointed and about i cm. 

 long. The leaves are 5 in each sheath, very 

 slender and flexible, pale green or bluish 

 green, 7 to 12 cm. long; their sheaths are 

 loose, composed of several nearly separate 

 scales, and fall away soon after the leaves 

 are grown. The staminate flowers are nu- 

 merous, borne laterally on the lower part of 

 shoots of the season, oblong, blunt, yellow, 

 and about i cm. long, subtended by several 

 scales. The pistillate flowers are stalked, 

 usually several together at the ends of the 

 shoots, and at flowering time in June are 

 about 7 mm. long. The cones ripen in the 

 summer of the second season, when their 

 scales open and release the seeds; they are 



stalked, drooping, cylindric, pointed, resinous, 10 to 15 cm. long and about 2.5 

 cm. thick, their scales are sliglilly thickened and blunt at the apex, otherwise 

 thin, without any spine or prickle; the seeds are about 2 cm. long, the terminal 

 wing three or four times as long as the body. The cones usuallv fail from the 

 tree during the winter after the seeds are released. 



Fig 



White PiiK 



