■IL' I- III. I. M WIAI. 



7(». .\.\ill;ir\- 1)U(1> often sui)erp<>sc(l ; twigs often with 

 tli.)rn>; leaf scars small. Forestiera. (75). 



7(1. .\xillary buds not superposed; no thorns on the twigs; 

 leaf scars rather large. 77. 



77. Twigs and buds pubescent; lateral buds cylindrical or 

 hemispherical: bud scales dry; leaf scar concave, on 

 the short petiole base; lenticels large and con- 

 spicuous; fruit a drupe. Chionanthus. (78). 



77. Iluds rough or pubescent; twigs glabrous or pubes- 

 cent, sometimes 4-angled; lateral buds somewhat 

 riattened. obtuse; bud scales rather dry; leaf scar 

 close^ to the bark; lenticels not large; fruit a 

 samara. Fraxinus. (74). 



77. Axillary buds minute and sunken; twigs glaljrous or 

 pubescent; stipules dry, prominent; or with promi- 

 nent stipular scars. Cephalanthus. (82). 



7n With 4 distinct stipular scars; terminal bud self- 

 pruned; twigs green -with strong odor. 



Staphylea. (37). 



7S. Without definite stipular scars; twags not green or if 

 so then the terminal bud present. 79. 



7!». Trees or shrubs with numerous bundle scars, some- 

 times in 3 areas, in a large heart-shaped leaf scar; 

 pith rather large; terminal bud large, with nu- 

 merous scales. Aesculus. (40). 



71). P)undle scars 3 or sometimes 5. 80. 



80. Terminal bud with 2 long acuminate inibescent outer 

 scales; line connecting the uppermost leaf scars 

 notched. 81. 



so. Terminal bud with one main ])air of \isij)le scales and 

 a smaller pair at the base. Viburnum. (83). 



80. Terminal bud with several pairs of visible scales; 

 bundle scars 3-5; twigs sometimes green. 



Acer. (41). 



■■^'1. .\\illary buds usually minute and undeveloped ex- 

 cept at the base of the peduncle which is self- 

 pruned; twigs green or reddish-green, glabrous or 

 nearly so. Cynoxylon. (80). 



>^\. Axillary buds normally well developed and prominent; 

 twigs often very pubescent. Cornus. (79). 



