TkKKS OK Tin-: North kkn L'mtkd Sr.\i» 1.' 



1 i. With terminal thorns and some axillar>- thorns: 



leaves tapering to the base ; narrow or slender- 



cuneate. Bumelia. (69). 

 V). Leaves evergreen, coriaceous, some on wood of the 



previous season. 10. 

 l-"). No lea\es on wood of the previous season. 17. 

 Iti. Leaves green on l)oth sides, thick, coriaceous, oblong 



to oblanceolate, 5-10 in. long; winter buds very 



scal> Rhododendron. (00). 

 10. Leaves green on both sides, or glaucous beneath. 



coriaceous, 2-5 in. long; oval or oval-lanceolate. 



winter buds naked. Kalmia. (67). 

 10. Leaves bright green above, paler beneath, coriaceous, 



-1-5 in. long, pointed at l)oth ends ; bark aromatic. 



Persea. (15). 



17. Pith with prominent diaphragms but solid ; vascular 



bundles in base of petiole 3-7. 18. 

 IT. Pith not both diaphragmed and solid, but sometimes 

 with lenticular cavities. If). 



18. Leaves 2-ranked ; bark with fetid odor; vascular 



bundles in base of petiole 5-7. Asimina. (14). 



]!<. Leaves not 2-ranked; vascular bundles in base of 

 petiole 3. Nyssa. (81). 



li>. Leaves resin-dotted, waxy-dotted or punctate, oblong- 

 lanceolate, spatulate, or oblanceolate, short-pointed, 

 narrowed at the base. Myrica. (63). 



1!>. Leaves not dotted nor punctate. 20. 



20. Pith prominently o-anglcd ; leaves with deciduous 

 stipules and with bristle tips. Quercus. (56). 



20. Pith cylindrical or nearly so; leaves not bristle- 



tipped. 21. 



21. Leaves with the upper 2 lateral \eins more or less 



l)arallel with the midrib. Cornus. (79L 



21. Leaves pinnateh" veined to the tip. 22. 



22. P)undle scar central; pith S()metinu-> diaphragmed 



with lenticular cavities. 23. 

 22. iJnndle scars 2 or more; pith without lenticular 

 cavities, 24. 



