31 ° 
[Vol. V, No. 8, 
The Ohio A'aturalist. 
84. Leaves entire or three-lobed, bark spicj'-aromatic; internodes very 
unequal. Sassafras. 
84. Leaves crenate, serrate, dentate, or lobed, not star-shaped and not 
spicy-aromatic. 85. 
85. Pith 5-angled; trees usually with resinous buds; leaves usually 
broad based. Populus. 
85. Pith cylindrical or nearly so. 86. 
86. With prominent typical thorns; trees or erect shrubs. Crataegus. 
86. Without thorns but often with prickles or bristles; low shrubs. 87. 
87. Leaves lanceolate or ovate-lanceolate with gland-tipped serrations 
or dentations; low erect shrubs. Ceanothus. 
87. Leaves broad and more or less lobed. 88. 
88. Petioles and twigs densely brown-bristly, leaves 4-8 in. broad, 
angled or lobed. Rubus. 
88. Twigs not bristly, if the petioles are bristly then the leaves much 
smaller. 89. 
89. Bundle scars or vascular bundles in base of petiole widely separate; 
petiole not decurrent at the middle or if so then the petiole with 
long hairs or distinctly pubescent; plants often prickly; fruit a 
berry. Ribes. 
89. Bundle scars or vascular bundles in base of petiole closely crowded 
or nearly confluent ; petioles strongly decurrent at the sides and 
middle; glabrous or only minutely pubescent; plant not prickly; 
fruit a capsule. Opulaster. 
—90— 
90. Leaves glabrous. 91. 
90. Leaves pubescent or woolly at least below. 92. 
91. Leaves 3 i'l- long, bitter. Oxycoccus. 
91. Leaves 1 - 2 }/^ in. long, acid. Andromeda. 
92. Leaves with a fragrant odor, densely tomentose beneath; erect, 
resinous shrubs. Ledum. 
92. Leaves 2-ranked, small, oval or ovate, hairy; creeping shrubs. 
Chiogenes. 
—93— 
93. With tendrils; leaves digitate. Parthenocissus. 
93. Without tendrils; leaves trifoliate or pinnate. 94. 
94. Pith diaphragmed, with cavities; large trees with pinnate leaves. 
Juglans. 
94. Pith not diaphragmed. 95. 
95. Leaves trifoliate or odd-pinnate. 96. 
95. Leaves evenly pinnate or bipinnate; axillary buds superposed. 109. 
95. Leaves odd-bipinnate, serrate; twigs and leaves usually prickly. 
Aralia. 
96. Leaves with spine-tipped teeth, evergreen. Berberis. 
96. Leaves not with spine-tipped teeth; but some may be prickly. 97. 
97. Lobes or teeth at the base of the leaflets with prominent green 
glands beneath; leaves pinnate, very large with disagreeable 
odor. Ailanthus. 
97. Lobes or teeth if present without green glands. 98. 
98. With stipular spines a pair for each leaf; leaflets entire. 99. 
98. Without stipular spines, but some may have thorns or prickles. 100. 
99. Leaflets oval or ovate, not pointed, usually mucronate, not jumetate 
Robinia. 
99. Leaflets ovate, pointed, glandular-punctate. Xanthoxylum. 
100. Base of petiole covering the axillary buds; not prickly. 101. 
100. Base of petiole not covering the axillary buds. 103. 
101. Leaves 3-foliate, leaflets crenulate, glandular punctate; bark with 
disagreeable odor; axillary buds superposed. Ptelea. 
