The Conifers. 



301 



149. PinussylvestTis: Scotch Pine.— 1. Atwigwith a defected pistil ate flower. 2. Anoldertwig, 

 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. 5. The pistilate 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 size, and enlarged. 13. Staminate flowers, somewhat enlarged. 

 14,15. Stamens. 16,17. Pollen-grains inflated. 18. A seedling, showing five seed-leaves. 

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

 some of them being reslnlferous canals. 



