in large clusters; plant not prickly;
branchlets not heavy-tipped 15. _Melia._

=r.= Leaves once to twice irregularly odd-pinnate; the
leaflets very irregularly and coarsely toothed; a
small, round-headed tree with bladdery pods 24. _Koelreuteria._

=r.= Leaves irregularly about twice odd-pinnate; the
leaflets lanceolate; quite a low plant with few
heavy-tipped branches; plant without prickles 27. _Rhus._

=r.= Leaves 2 (sometimes 3) times odd-pinnate; tree-stem
with prickles; small tree or shrub, with few branches
44. _Aralia._

=r.= Leaves once to twice abruptly pinnate; large tree with
slender-tipped branches, usually very thorny 34. _Gleditschia._

=s.= Leaves very large (2 ft. or more long), about twice
abruptly pinnate; leaflets broad and often 2 in.
long; branches blunt; no thorns 33. _Gymnocladus._

=s.= Leaves and leaflets much smaller, leaves quite
irregularly once or twice abruptly pinnate; branches
slender-tipped; large tree, usually very thorny
34. _Gleditschia._

=s.= Leaves twice abruptly pinnate; leaflets over 400 in
number, with midrib near the upper edge 35. _Albizzia._

=s.= Leaves regularly once pinnate, not over 2 ft. long.
(=t.=)

=t.= Leaves abruptly pinnate, not over 5 in. long; leaflets
8-12, small, mucronate-pointed 29. _Caragana._

=t.= Leaves odd-pinnate; shrub or small tree, with few,
heavy-tipped branches; no spines or prickles 27. _Rhus._

=t.= Leaves odd-pinnate; leaflets large (3-5 in. long), not
usually over 11 in number; round-topped tree 30. _Cladrastis._

=t.= Leaves odd-pinnate; leaflets less than 3 in. long,
frequently 11-21 in number; often with spines at the
bases of the leaves in the place of stipules
12. _Xanthoxylum_ or 31. _Robinia._

=u.= Leaves palmately compound. (=CC.=)

=u.= Leaves pinnately compound. (=BB.=)

=u.= Leaves simple, evergreen, sessile, in whorls around
the stem, which they completely cover (98a. _Araucaria._)

=u.= Leaves simple, opposite, evergreen, entire, over 2
in. long