SPERMATOPHYTA GYMNOSPERMS 



329 



Pinus. (Tourn.) L. 



Evergreen trees with short scale-like leaves and longer leaves in bundles ; 

 the ordinary foliage leaves linear, in bundles varying from 2-5, rarely 1 ; sta- 

 mens in catkins, borne at bases of shoots; filaments short; anthers longitud- 

 inally dehiscent; pistillate, bearing aments, solitary or clustered on the twigs 

 of the preceding season consisting of numerous imbricated bracts, each with 

 an ovule-bearing scale; fruit a large cone; seeds 2 at the base of each scale; 

 winged above. About 75 species of wide distribution. Of these the more im- 

 portant are: White Pine (P. Strobus}, one of the most valuable of North 

 American Pines; Sugar Pine (P. Lambertiana} of California and Oregon; Aus- 

 trian Pine (P. Laricio), furnishing Austrian turpentine; the Long-leaved Pine 

 (P. palustris) of the South, the most important source of turpentine, which 



Fig. 128. White Pine (Pinus Strobus). 1. Branch bearing staminate flowers. 2. 

 Branch bearing pistillate flowers and young cones. 3. Anther, enlarged. 4,5. Scales of 

 pistillate flower, enlarged. 6. Autumn branch bearing young cones. 7. Fruiting branch 

 with young cone. 8. Scale of cone with seeds attached. 9. Seeds with wings attached. 

 10. Seeds, enlarged. 11. Seedling plant. 1, 2, 6, 7, 8, 9 one-half natural size. (S. B. 

 Green). 



