KEY TO SOME OF THE COMMON TREES 101 



*Leaves notched less than halfway to the midrib. 



12. Red Maple. 

 **Leaves divided more than halfway. 13. Silver Maple. 

 2. The depressions between the lobes broad and rounded, 

 twigs brown or greenish. 



*Twigs slender. 14. Sugar Maple. 



**Twigs stout, petioles when broken exude acrid milky sap, 



which coagulates. 15. Norway Maple. 



b. Leaves simple, entire, pinnately veined. 



16. Flowering Dogwood. 



c. Leaves compound. 



1. Palmately compound. 17. Horse-chestnut. 



2. Pinnately compound. 



♦Leaflets 3 to 5, coarsely dentate. 18. Box Elder. 



♦♦Leaflets 5 to 9, finely serrate, each with a short stalk. 



19. White Ash. 

 ♦♦♦Leaflets 7 to 11, finely serrate, without stalks. 



20. Black Ash. 

 II. Leaves large, entire, growing 3 at a joint on the twigs. 



21. Catalpa. 

 III. Leaves alternate on the twigs, one at a joint. 

 a. Leaves simple. (For b see page 103.) 



1. Leaves palmately veined. 



♦Leaves star-shaped, with 5 to 7 sharp lobes. 



22. Sweet Gum. 

 ♦♦Leaves broadly oval, toothed or irregularly lobed. 



23. Sycamore. 



2. Leaves pinnately veined. 



♦Not deeply cut or lobed. 



fLeaves narrow, lanceolate. 



•Twigs slender, not greatly drooping, leaves smooth 

 and green both sides. 



24. Fragile or Crack Willow. 

 ' "Twigs slender, not greatly drooping, leaves with 

 small hairs and pale on both sides. 



25. White Willow. 

 ' ' "Twigs very slender, drooping, leaves smooth. 



26. Weeping Willow. 

 f fLeaves broader, oval or ovate. 



"Leaves dentate, smooth. 27. Beech. 



• "Leaves serrate. 



'Bark on twigs and branches smooth, shining, 

 black, bitter to the taste. 



28. Black Cherry. 



