June, 1905.] Key to the Genera of Ohio Woody Plants. 
371 
101. Leaves 3-foliate, fragrant; axillary buds not superposed; bark 
resinous or milky. Rhus. 
101. Leaves pinnate, not punctate. 102. 
102. Leaflets serrate; pith very large; bark resinous or milky. Rhus. 
102. Leaflets entire; pith small, bark not resinous or milky; trees. 
Cladrastis. 
10.3. Leaflets entire or if occasionally few-toothed then the rachis 
prominently winged. 104. 
10.3. Leaflets serrate or dentate, the rachis not winged. 105. 
104. Stipules large, membranous and sheathing; leaflets 3-5, long silky. 
Dasiphora. 
104. Stipules small, not sheathing; leaflets prominently mucronate, bark 
with strong odor. Amorpha. 
104. Stipules none, bark with a resinous or milky sap, often poisonous. 
Rhus. 
105. With bristles or prickles; shrubs. 106. 
105. Without bristles or prickles; leaves pinnate. 107. 
105. Without bristles or brickies; leaves trifoliate, poisonous. Rhus. 
106. Leaves usually pinnate, the leaflets usually of about the same type, 
if 3-foliate then the petiole separates close to the bark leaving a 
definite leaf scar; fruit an achene, a number inclosed in the fleshy 
perigynous disc. Rosa. 
106. Leaves simple and lobed, or 3-7-foliate; if pinnate then the terminal 
leaflet usually larger or broader than the others, petiole base 
persistent; fruit an aggregate of drupelets. Rubus. 
107. Pith cylindrical or nearly so; leaves with stipules; vascular bundles 
in base of petiole 3-5. 108. 
107. Pith 5-angled; stipules none, base of petiole with numerous vascular 
bundles, scattered or in .3 areas. Hicoria. 
108. Trees; leaflets obtuse or acute at the apex. Sorbus. 
108. Shrubs; leaflets long acuminate. Sorbaria. 
109. Pith small; base of petiole covering the axillary buds; usually with 
prominent thorns. Gleditsia. 
109. Pith very large, base of petiole not covering the axillary buds; 
without thorns, Gymnocladus. 
— no— 
110. Leaves simple. 116. 
110. Leaves compound with tendrils. Bignonia. 
no. Leaves compound, with 3 or more leaflets, petioles and petiolules 
coiling; climbing vines. Clematis, 
no. Leaves compound without tendrils. 111. 
111. Leaves digitate with 5 or more leaflets. Aesculus. 
111. Leaves trifoliate or pinnate. 112. 
112. With numerous pit-like glands on top of the petiole near its base; 
vines climbing by rootlets. Tecoma. 
112. No glands on the top of the petiole; shrubs or trees. 113. 
113. Base of petiole covering the axillary buds; leaflets dentate, lobed, 
or nearly entire. Acer. 
1 13. Base of petiole not covering the axillary buds. 1 14. 
114. Leaves trifoliate, serrate; bark with strong odor. Staphylea. 
114. Leaflets 5-1 1. 115. 
1 15. Leaves often with gland-tipped stipels; pith large; shrubs. Sambucus. 
115. Leaves without stipels; pith small; trees. Fraxinus. 
—116— 
116. Leaves pinnately veined. 123. 
1 16. Leaves palmately veined or at least with 2 prominent side ribs from 
the base. 117. 
117. Leaves entire or if somewhat 3-lobed with entire margin. 118. 
