The Conifers. 



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149. Pinus sylvestris : Scotch Pine. 1. A twig with a defected pistilate flower. 2. An older twig, 

 bearing a cluster of oval staminate flowers. 3. The former enlarged, ns it flpproaches 

 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 i:>. Staminate flowers, somewhat enlarged. 

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

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

 some of them being resiniferous canals. 



