xi 



27a. Leaflets entire 7a, in LEGUMINOSAE, p. 58. 



27b. Leaflets entire except for a few large glandular teeth near their 

 base SIMARUBACEAE, p. 65. 



27c. Leaflets serrate their entire length 28. 

 28a. Upper leaflets less than 25 mm. wide 



4b, in ROSACEAE, p. 61. 

 28b. Upper leaflets more than 25 mm. wide 



JUGLANDACEAE, p. 21. 

 29a. Leaves opposite 30. 

 29b. Leaves alternate 32. 



30a. Leaves entire CORtfACEAE, p. 83. 



30b. Leaves toothed or lobed, not entire 31. 



31a. Leaves lobed Ib, in ACERACEAE, p. 70. 



31b. Leaves merely toothed 27b, in CAPRIFOLIACEAE, p. ill. 



32a. Leaves entire 33. 

 32b. Leaves toothed 36. 

 32c. Leaves lobed 47. 



33a. Leaves heart-shape 3a, in LEGTJMINOSAE, p. 58. 



33b. Leaves not heart-shape 34. 



34a. Twigs and foliage spicy-aromatic Ib, in LAURACEAE, p. 41. 

 34b. Twigs and foliage not aromatic 35. 



35a. Pith 5-angled; fruit an acorn 3a, in FAGACEAE, p. 22. 



S5b. Pith not 5-angled; fruit a berry la, in CORNACEAE, p. 83. 



36a. Leaves oblique at base, i. e., one side of the leaf larger than 



the other 37. 



36b. Leaves symmetrical, not oblique at base 38. 

 37a. Leaves heart-shape, about as broad as long TILIACEAE, p. 72. 

 37b. Leaves oval or ovate, much longer than wide 



la, in URTICACEAE, p. 23. 



38a. Stems thorny 41b, in ROSACEAE, p. 54. 



38b. Stems not thorny 39. 

 39a. Leaves finely toothed, with 3 many teeth per centimeter of 



margin 40. 

 39b. Leaves coarsely toothed, with 1 2 teeth per centimeter of 



margin 46. 



40a. Petioles laterally compressed 2a, in SALICACEAE, p. 19. 

 40b. Petioles not compressed 41. 

 41a. Leaves, or many of them, crowded on short spur-like branches 



42. 

 41b. Leaves scattered, not on short spur-like branches 43. 



42a. Bark of the trunks separating in thin papery or leathery 

 sheets BETULACEAE, p. 21. 



42b. Bark of the trunk not papery or leathery 



24b, in ROSACEAE, p. 53. 



