10 



PlNACEAE 



5. 



10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 1. 



20. 



Conical. 



Rounded. 



Conial. 



Rather weeping. 



Neither conical nor weeping. 7. 



Needles very glaucous. 



Needles only slightly glaucous. 8. 



Needles blue-green. (Scotch pine). 



Needles yellow when young. 



Needles rather short (under 8 cm.) 



Needles rather long (over 9 cm.), dull. 



Twigs glaucous. (Scrub pine). 



Twigs not glaucous. 11. 



Tree. 



Round shrub. 



Trees. 13. 



P. sylvestris columnaris. 

 P. sylvestris pumila. 

 P. sylvestris fastigiata. 

 P. sylvestris pendula. 



P. sylvestris argentea. 



P. sylvestris. 

 P. sylvestris aurea. 

 10. 



(Black pine). 12. 

 P. viginiana. 



P. montana. 

 P. montana Mughus. 



Shrub. 

 Pyramidal. 

 Round-topped. 

 Bark orange. 



(Austrian pine). 



P. nigra pygmaea. 

 P. nigra. 



P. nigra austriaca. 

 P. nigra cebennen&is. 



Bark rather red: needles glossy. (Red pine). P. resinosa. 



Needles moderately long (under 15 cm.) . (Pitch p.) . P. rigida. 



Needles very long (over 15 cm.). (Loblolly pine). P. Taeda. 



Twigs glabrate. 17. 



Twigs tomentose. (Stone pine). P. Cembra. 



Trees. 18. 



Dwarfed. 19. 



With spreading branches. 



With ascending branches. 



Needles very glaucous. 



(White pine). P. Strobus. 



P. Strobus fastigiata. 



P. Strobus alba. 



Not very glaucous. 

 Bush-like. 

 Umbrella-shaped. 

 Prostrate. 



20. 



P. Strobus brevifolia. 



P. Strobus umbraculifera. 



P. Strobus prostrata. 



SCIADOPITYS. Umbrella Pine. 

 Evergreen percurrent trees with ductless soft white wood 



