13a. Buds with about 3 visible bud-scales 



2fe, in FAGACEAE, p. 22. 

 13b. Terminal bud large, with 4 or more visible bud-scales 



Ib, in JUGLANDACEAE, p. 21. 



14a. Flowers conspicuous, brightly colored, at least 8 mm. wide r 



with both calyx and corolla 15. 

 14b. Flowers inconspicuous, seldom brightly colored, and then 



less than 8 mm. wide 17. 



15a. Flowers irregular, pink or red 3a, in IEGUMINOSAE, p. 58. 

 15b. Flowers* regular, white 16. 



16a. Ovary one, superior, in the center of the flower 



32b, in ROSACEAE, p. 54. 



16b. Ovary inferior, appearing as a swelling below the calyx at 

 the summit of the pedicel 42b, in ROSACEAE, p. 55. 



17a. Leaf-scars and buds opposite 18. 

 17b. Leaf-scars and buds alternate 19. 



18a. Bundle-scar one in each leaf-scar 



Ib. in OLEACAE, p. 88. 

 18b. Bundle-scars 3 or more in each leaf-scar 



ACERACEAE, p. 70. 



19a. Bundle-scar 1 in each leaf-scar Ib. in LAURACEAE, p. 41, 

 19b. Bundle-scars 3 in each leaf-scar 20. 

 19c. Bundle-scars 5 in each leaf-scar 



7a, in LEGUMItfOSAE, p. 58 



20a. Branches thorny 5a, in LEGUMEVOSAE, p. 58. 



20b. Branches not thorny 3a, in URTICACEAE, p. 24. 



21 



21a. Leaves narrow, needle-like or scale-like; trees mostly ever- 

 green PEVACEAE, p. 1. 



21b. Leaves broader, flat, never needle-like or scale-like, falling in 

 winter 22. 



22a. Leaves compound 23. 

 22b. Leaves simple 29. 



23a. Leaves opposite 24. 

 23b. Leaves alternate 26. 



24a. Leaves palmately compound with 5 7 leaflets 



SAPEVDACEAE, p. 70. 

 24b. Leaves pinnately compound 25. 



25a. Leaflets 35 la, in ACERACEAE, p. 70. 



25b. Leaflets 711 Ib, in OLEACEAE, p. 88. 



26a. Stem or branches thorny 4a, in LEGTJMBTOSAE, p. 58. 



26b. Stem or branches not thorny 27. 



