TkkKS ()!• TIIK XoKTHKKN UnITED STyVTJEii-. J 2'\ 



7. I'"(»lia!4c leaves of two types. >ralc-like and ^uhulaie. 

 opposite or in throes; tin- scale-like leaves l-ranked. 

 apprcsscd. causing the t\\it;s to ajipear quad- 

 rang-uiar, the subulate leaves spreading; one or both 

 tj'pes of leaves on a plant; carpellate cone develoj)- 

 ing into a bluish-black, berry-like fruit. 



Juniperus. i 1 1 i. 



s. Lea\e> with spine-tipped lobes or teeth. Ilex. (.36). 



S. Leaves without s])incs. !). 



!>. Leaves pubescent at least below, lanceolate, niucro- 

 nate, not evergreen; buds clustered at the tip of the 

 twig; trees with o-angled pith. Quercus. (on). 



!». Leaves glabrous below; pith not o-angled. 10. 



10. Leaves green on both sides, thick, coriaceous, oblong 



to oblanceolate, o-lO in. long; winter buds very 

 scaly. Rhododendron. (60). 

 1". Leaves green on both sides or glaucous beneath, 

 coriaceous, 2-o in. long, oval to oval-lanceolate; 

 w'iuter buds naked; erect shrubs. Kalmia. (67). 

 i<>. Leaves bright green above, paler beneath, coriaceous, 

 l-o in. long, pointed at both ends; bark aromatic. 



Persea. (15). 

 —11— 



11. Twigs with thick wart-like dwarf branches; gynino>- 



l)erms. ]2. 



11. Twigs withcnit true dwarf branches. I"). 



12. Young twigs covered with scales. Larix. (<i). 

 !2. Twigs without scales. Ginkgo. (1). 



l-'». Twigs with numerous small scattered self-pruning 

 scars, without apjiarent leaf scars but with minute 

 dry scale leavi-s. with feather-like dwarf branches, 

 some usually remaining in winter; foliage leaves 

 s])rea(ling into two rank.s; roots often with knees'; 

 a conifer. Taxodium. (2). 



LI. Twigs with evident leaf scars and lateral winter buiN. 



n. 



14. Leaf scars alternate, lo. 

 14. Leaf scars opposite or whorled. 72. 

 IV Twigs with distinct and complete stii)ular ridges or 

 rings at the leaf node< Ul 



