14 TREES. 



Simple. 



41. Leaves on slender deciduous twigs. Taxodium. 

 Leaves clustered on short stout spurs/ 42. 



42. Scales of cone persistent. Larix. 

 Scales of cone deciduous. Pseudolarix. 



43. Leaves fan-shaped, veined from the base. Ginkgo. 

 Leaves not fan-shaped, netted-veined. 44. 



44. Leaves simple. 45. 

 Leaves compound. 88. 



45. Stipule-scars encircling the twigs: buds net sharp. 46. 

 Stipule-scars short, or else buds pungent. 4Q. 



46. Leaves entire : sap not milky. Magnolia. 

 Leaves lobed. 47. 



47. Buds flattened or 2-edged : sap not milky.. Liriodendron. 

 Buds not flattened. 48. 



48. Sap not milky : buds fluted. Platanus. 

 Sap milky : buds not fluted. Ficus. 



49. Buds with a single scale, in front. Salix. 

 Buds naked or with several scales. 50. 



50. Buds fusiform, hard, very long and spreading. Fagus. 

 Buds not long and spreading. 51. 



51. Mucilaginous and aromatic: twigs green. Sassafras. 

 Silvery- or brown-scurfy. Elaeagnus. 

 Not scurfy or very mucilaginous. 52. 



52. Leaves 2-ranked, at least on spreading branches. 53. 

 Leaves in more than 2 ranks. 67. 



53. Leaves palmately nerved. 54. 

 Leaves pinnately veined. 58. 



54. Sap milky : hairs not star-shaped. 55. 



Sap neither milky nor flowing freely. 56. 



55. Twigs and leaves hairy. Broussonetia. 

 At most downy or velvety or rough. Mortis. 



56. Twigs moderate : pith continuous. 57. 



Twigs very slender: pith often chambered. Celtis. 



57. Leaves entire, glabrate. Cercis. 

 Leaves serrate : sometimes with stellate hairs. Tilia. 



