i. Leaf-lobes coarsely sinuate-toothed........ 
nh dptbeasacenerutahe wagon PLATANUS, p. 141. 
ii. Leaf-lobes serrate. 
j. Branches armed with stiff, sharp thorns; 
sap not milky......CRATAEGUS, p. 151. 
jj. Branches unarmed; sap milky........... 
Shag sua wkiv ge tavdbamanmcinns MORUS, p. 135. 
cc. Leaves opposite or whorled. 
d. Margin of leaves entire or only slightly undulate. 
e. Leaves 3-5 inches long; spray fine; fruit an ovoid, 
scarlet drupe ............e. cues CORNUS, p. 202. 
ee. Leaves 5-12 inches long; spray coarse; fruit a long, 
slender-cylindrical capsule......CATALPA, p. 222. 
dd. Margin of leaves serrate to lobed. 
e. Margin of leaves finely serrate.................0-- 
inges Kigaemaiash anne aeaclas VIBURNUM, p. 229. 
ee. Margin of leaves distinctly lobed..... ACER, 
aa. Leaves compound. 
b. Leaves alternate. 
c. Leaves simple-pinnate. 
d. Branchlets armed with short, sharp prickles.......... 
ish elake Gavel nen aleiabtisl mei lt dae a aa ROBINIA, p. 169. 
dd. Branchlets unarmed. 
e. Leaflets entire with the exception of 2 or more 
coarse, glandular teeth at the base................. 
Speaks aeaanbae eat aw erat AILANTHUS, p. 171. 
ee. Leaflets serrate the entire length. 
f. Upper leaflets less than 1 inch broad. 
g. Trunk and large branches armed with stout 
spines; leaflets 34-1%4 inches long............. 
nya seve adh Pe OremeR eR GLEDITSIA, p. 165. 
gg. Trade and large branches unarmed; leaflets 2-3 
Inchés longs secwesavevevodscens PYRUS, p. 142. 
ff. Upper leaflets 1-5 inches broad. 
g. Leaflets 5-11; pith homogeneous............... 
gg. Leaflets 11-23; pith chambered................ 
caliecacs ive dae a aint on ynaen teas JUGLANS, ; p. 60. 
cc. Leaves bi-pinnate. 
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