Procccdiiio-s of tlic Oliio Slate Academy of Science 97 



43. Pith more or less 5-angied, yellowish or brownish; 



terminal bud large ; bundle scars scattered ; trees with 

 tough twigs. Hicoria. (15). 



44. Leaf scar surrounding the hairy axillary buds ; bundle 



scars 5-9; terminal bud self-pruned. Cladrastis. (47). 



44. Leaf scar not surrounding the axillary buds. 45. 



45. Bundle scars 3 ; buds spherical, bark light gray ; leaf 



scars heart-shaped ; stipular scars none. 



Sapindus. (59). 



45. Bundle scar usually i ; buds rounded or somewhat 



pointed ; stipular scars or minute stipules present. 



Ilex. (54). 

 -46- 



46. Terminal and lateral buds stalked ; pith 3-angled ; both 



staminate and carpellate catkins present all winter. 



Alnus. (19). 



46. Buds sessile or nearly so ; pith not 3-angled. 47. 



47. Leaf scars surrounding the axillary buds which are 



usually sunken ; terminal bud self-pruned ; bark 

 resinous; pith large. Rhus. (52). 



47. Leaf scars not surrounding the axillary buds. 48. 



48. Bundle scar i, or if several then closely crowded and 



confluent, appearing as i. 49. 



48. Bundle scars more than i. 54. 



49. Stipular scars and stipules present. 50. 



49. Stipular scars and stipules none. 51. 



50. Terminal bud absent; bud scales dark brown or black. 



Rhamnus. (60). 



50. Terminal bud present ; stipules minute, usually per- 



sistent. Ilex. (54). 



51. Terminal bud present. 52. 



51. Terminal bud absent. 53. 



52. Pith diaphragmed, with cavities ; bark reddish ; outer 



bud scales several, short. Symplocos. (67). 

 52. Pith not diaphragmed ; bark green, very spicy aromatic ; 

 internodes very unequal. Sassafras. (35). 



