PROBLEM Qin^.STI()NS 103 



•Lobes cut less than halfway to midrib, smootli, acorn 

 large (1 inch long) with shallow cup. 



43. Red Oak. 



' "Lobes cut more than halfway, acorns small {\ inch or 



less), cup covering at least \ of acorn. 



'Leaves smooth both sides, scales of cup pressed 



down at tip. 44. Scarlet Oak. 



"Leaves hairy below, at least in the angles of the 



veins, scales of cup spreading at tip. 



45. Black or Yellow-barked Oak. 

 b. Leaves compound. 



1. Trunks or branches thorny, leaflets rounded at the tip. 



*Thorns large, often 3 parted. 46. Honey Locust. 



**Thorns small, in pairs at the base of leaves, or sides of 



leaf scars. 47. Common Locust. 



2. No thorns, leaflets pointed at tip. 



*Twig very stout, ^ inch or more in diameter. Leaflets 

 11 or more. 

 fTwigs smooth. 48. Ailanthus. 



tfTwigs very hairy. • 49. Staghorji Sumach. 



**Twigs more slender, not over j inch thick at tip. 

 fLeaflets 11 or more. 



•Twigs smooth, nut round. 50. Black Walnut. 



' "Twigs downy, nut oval. 51. Butternut. 



t fLeaflets 9 or less. 



•Bark of tree furrowed, not in long flat plates. 



52. Pignut. 

 ' 'Bark of tree in long flat plates loose at lower end. 



53. Shagbark Hickory. 



Problem Questions 



1. What are the direct uses of stems to man? 



2. What are the direct uses of stems to plants? 



3. How are forests of value to man? 



4. Name three enemies of the forests. 



5. Name three ways of conserving our forests. 



6. How do the forests of New York indirectly influence the 

 commercial importance of New York city? 



7. What special tree products give factories employment in 

 your home city? 



8. Of what value are trees in a city jiark? 



9. Look in your Civic Biology and find ten ways in wliich troos 

 are of value in a city. 



