89. Pith of twigs dark and chambered black walnut [208] 89. Pith of twigs not dark, continuous [90]
90. Nut nearly cylindric, seed sweet pecan [209] 90. Nut 4-angled, seed bitter bitter pecan (rare) [210]
Leaves Compound and Opposite
91. Vines [92] 91. Not vines [94]
92. Leaves palmately compound (alternate) Virginia creeper [262] 92. Leaves not palmately compound [93]
93. Twice-pinnately compound (alternate) pepper vine [263] 93. Once-pinnate trumpet creeper [280]
94. Palmately compound fetid or Ohio buckeye [258] 94. Not palmately compound [95]
95. With terminal leaflet [96] 95. Without terminal leaflet mesquite [240]
96. Twice-pinnately compound (alternate) chinaberry [248] 96. Once-pinnate [97]
97. Leaflets 5 to 11, usually 7, twigs not bright green [98] 97. Leaflets 3 to 5 (rarely 7 or 9), twigs bright green box elder [255]