TEHON: FIELDBOOK OF NATIVE ILLINOIS SHRUBS 21 



4. Leaves obtuse, only the 

 distal half or third of the 

 margin serrate 



Amelanchier, p. 133 



2. Leaf base rounded or tapered 

 to the petiole. 



5, Teeth distant and low 



Styrax, p. 242 



5. Teeth close and usually 

 prominent. 



6. Teeth rounded Ilex, p. 162 



6. Teeth sharp pointed. 



7. Low shrub with wrin- 

 kled bark. Vaccinium, p. 229 

 7. Tall shrubs with smooth 

 or rough bark. 

 8. Veins conspicuously 

 straight and extending 

 to teeth. 

 9. Usually 4 or 5 pairs 

 of veins per leaf 

 Betula, p. 64 



9. Usually 8 or 9 pairs 

 of veins per leaf 

 Alnus, p. 66 



8. Veins either not con- 

 spicuously straight or 

 not ending in teeth. 



10. Buds superposed, 

 pith chambered 

 Itea, p. 90 



10. Buds solitary, pith 

 solid. 



11. Veins parallel 

 and distinct 

 nearly to the 



margin 



. . . Rhamnus, p. 177 



11. Veins not con- 

 spicuously paral- 

 lel, branching to- 

 ward the margin 

 Spiraea, p. 101 



A. Leaves definitely compound, composed of 2 or more leaf- 

 lets. 

 12. Leaves opposite, 2 at a node. 

 13. Leaf margins entire. 

 14. Leaflets 2 per leaf Bignonia, p. 246 



14. Leaflets 3 per leaf Clematis, p. 75 



13. Leaf margins toothed. 



15. Leaflets few, palmately arranged. 



