e of the twigs opposite 79. _Broussonetia._

=l.= Fruit edible; leaves not very hairy, never opposite 78. _Morus._

=m.= Leaves of 3 entire-edged leaflets; fruit a pea-like
pod 28. _Laburnum._

=m.= Leaves of 3 quite regularly serrate,
transparent-dotted leaflets 13. _Ptelea._

=m.= Leaves once or twice pinnate; the leaflets entire.
(=s.=)

=m.= Leaves once or twice pinnate; the leaflets with
margins more or less serrate or notched. (=n.=)

=n.= Leaves irregularly once to twice, in one case three
times, pinnate. (=r.=)

=n.= Leaves regularly once pinnate. (=o.=)

=o.= Leaves less than 1 ft. long, on a small, quite
prickly plant; fruit very small pods (1/4 in. long)
12. _Xanthoxylum._

=o.= Leaves less than 1 ft. long; leaflets 3 in. or less
long; fruit bright-colored, berry-like pomes in
clusters, persistent through the autumn; plant not
thorny; branches not heavy-tipped. 37. _Pyrus._

=o.= Leaves usually larger on the small tree or almost a
shrub; juice in most cases milky; branches
heavy-tipped 27. _Rhus._

=o.= Leaves 1-2 ft. long; leaflets 3 in. or more long;
fruit a bony nut with green fleshy coat; large trees.
(=q.=)

=o.= Leaves very large, 2 ft. or more long on the
rapid-growing branches; branches heavy-tipped; odor
of bruised leaves quite strong; leaflets 15 or more
in number; large trees; juice not milky. (=p.=)

=p.= Leaflets with 1-3 glandular notches at the base 17. _Ailanthus._

=p.= Leaflets entire at base, but very slightly serrate near
the tip 16. _Cedrela._

=q.= Coat of fruit more or less dehiscent into 4 valves;
nut smoothish; leaflets, except in one species, not
over 11 in number, usually 5-7 82. _Carya._

=q.= Coat of fruit not regularly dehiscent; nut, in the
wild species, rough-coated; leaflets, except in a
cultivated species, over 11 in number 81. _Juglans._

=r.= Leaves quite regularly twice odd-pinnate; leaflets
about 1 in. long; juice not milky; fruit rounded
berries