BB.= Leaves smaller; leaflets entire or quite evenly
toothed, usually over 5 in number 60. _Fraxinus._

=BB.= Leaflets coarsely and quite irregularly toothed, 3-5
(rarely 7) in number 26. _Negundo._

=CC.= Leaflets slender-lanceolate, almost entire; shrub
or small tree, 5-10 ft. high 67. _Vitex._

=CC.= Leaflets broader and serrate; usually large trees.
23. _AEsculus._

=DD.= Leaves with radiating ribs. (=FF.=)

=DD.= Leaves with feather-veining. (=EE.=)

=EE.= Leaves 2-6 in. long; flowers small, in large,
dense, terminal clusters 62. _Syringa._

=EE.= Leaves 1-4 in. long; flowers in pairs 48. _Lonicera._

=FF.= Leaves large, 6 in. or more long; two almost hidden
buds, one above the other, in the axils of the leaves
on the rapid-growing branches; flowers large, purple,
blooming in early spring; fruit rounded pods 64. _Paulownia._

=FF.= Leaves large, 6 in. or more long; flowers large,
white, blooming in June; fruit long pods 65. _Catalpa._

=FF.= Leaves 2-4 in. long, with red stems 3. _Cercidiphyllum._

=GG.= Leaves scattered singly over the stem, not in
bundles or clusters. (=JJ.=)

=GG.= Leaves in large or small clusters. (=HH.=)

=HH.= Clusters in whorls of many leaves around the stem
like an umbrella 100. _Sciadopitys._

=HH.= Leaves clustered in bundles of 2-6 93. _Pinus._

=HH.= Leaves clustered in bundles of over 8. (=II.=)

=II.= Leaves deciduous, soft 97. _Larix._

=II.= Leaves evergreen, rigid 98. _Cedrus._

=JJ.= Leaves hardly evergreen; spray quite slender.
(=ZZ.=)

=JJ.= Leaves fully evergreen. (=KK.=)

=KK.= Leaves awl or scale shaped, and mainly appressed to
the stem. (=WW.=)

=KK.= Leaves linear or needle shaped, and decidedly
spreading from the stem, though sometimes with a
decurrent base. (=LL.=)

=LL.= Leaves narrowed to a distinct though short stem.
(=RR.=)

=LL.= Leaves sessile; if narrowed, not so abruptly as to
form a petiole. (=MM.=)

=MM.= Leaves opposite or whorled on the stem. (=PP.=)

=MM.= Le