The Conifers. 



301 



12 



49. Pinusgylvestris: Scotch Pine. 1. A twig with a defected pistilate flower. 2. An older twig, 

 bearing a cluster of oval staminate flowers. 8. The former enlarged, as it approaches 

 the period of maturity. 4. The same after the scales have opened to allow the seeds to 

 escape. f>. The pietilate blossom, somewhat enlarged. 6,7,8. Scales. 9. The inside of 

 a scale, with the seeds in place 10 Back view of a thickened scale. 11, 12. The seed, 

 with its wing, natural si/.e. and enlarged 13. Staminate flowers, somewhat enlarged. 

 H. 15. Stamens. 16,17. Pollen-brains inflated. 18. A seedling, showing five seed-leaves. 

 19. Leaves in pairs. 20. Transverse section of a leaf, showing the structure of colls, 

 Borne of them being resiuiferous canals. 



