KEY TO IMPORTANT WOODY PLANTS 



27 



Pollen-producing catkins 



* . Tassellike seed-producing 





catkin 



I wig enlarged to show resin «v > f 

 droplets *. f 



H ■ '« - 



Resin-dotted twig 



Buds with overlapping bud 

 scales 



i » 



Persistent central stalk of 

 seed-producing catkin 



Tissue-papery-winged 



"seed" (enlarged) 



Immature pollen-producin; 

 catkins 



3-lobed, papery catkin 

 scale (enlarged) 



Water birch 



Persistent central stalk of 

 seed-producing catkin 



Enlarged twig 



t^SjSSS&s 



producing catkins 



F-40402'.l 



Bog birch 



