88 Proceedings of the Ohio State Academy of Science 



62. Pith not diaphragmed. 63. 



63. Leaves trifoliate or odd-pinnate. 64. 



63. Leaves evenly pinnate or bipinnate ; axillary buds super- 

 posed. 73. 



63. Leaves odd-bipinnate, serrate ; twigs and leaves usually 



prickly. Aralia. (74). 



64. Lobes or teeth at the base of the leaflets with prominent 



green glands beneath ; leaves pinnate, very large with 

 disagreeable odor. Ailanthus. (51). 



64. Lobes or teeth if present without green glands. 65. 



65. With stipular spines a pair for each leaf; leaflets mostly 



entire. 66. 



65. Without stipular spines, but some may have thorns or 



prickles. 67. 



66. Leaflets oval or ovate, not pointed, usually mucronate, 



not punctate. Robinia. (48). 



66. Leaflets ovate, pointed, glandular-punctate. 



Xanthoxylum. (49). 



67. Base of petiole covering the axillary buds ; not prickl3\ 68. 



67. Base of petiole not covering the axillary buds. 70. 



68. Leaves 3-foliate, leaflets crenulate, glandular punctate; 



bark with disagreeable odor; axillar}^ buds super- 

 posed. Ptelea. (50). 



68. Leaves pinnate, not punctate. 69. 



69. Leaflets serrate ; pith very large ; biark resinous or milky. 



Rhus. (52). 



69. Leaflets entire ; pith small, bark not resinous or milky. 



Cladrastis. (47). 



70. Leaflets entire or if occasionally few-toothed then the 



rachis prominently winged. 71. 



70. Leaflets serrate or dentate, the rachis not winged. y2. 



71. Leaflets decidedly inequilateral, obliquely lanceolate or 



falcate, acuminate. Sapindus. (59). 

 71. Leaflets not inequilateral or only slightly so, not slender 

 falcate, sometimes poisonous to the touch. 



Rhus. (52). 



