61. _Osmanthus._

=u.= Leaves simple, opposite, evergreen, entire, under 1
in. long 73. _Buxus._

=u.= Leaves simple, deciduous. (=v.=)

=v.= Branches ending in thorns; small trees, or shrubs.
(=AA.=)

=v.= Plants not thorny. (=w.=)

=w.= Leaves palmately lobed (one variety, rarely
cultivated, lacks lobes, but is heart-shaped with a
serrate margin), the lobes over 3 in number, or with
notches or serrations; fruit dry, winged 25. _Acer._

=w.= Lower leaves palmately 3-lobed, and heart-shaped at
base, upper ones ovate, all with entire margin; fruit
with juicy pulp covering the 4 seeds 66. _Clerodendron._

=w.= Leaves palmately lobed; fruit small, one-seeded,
berry-like drupes in large clusters, with flattened
stones, or large rounded clusters of flowers without
stamens or pistils; shrubs rather than trees 47. _Viburnum._

=w.= Leaves heart-shaped, entire or slightly angulated;
not lobed. (=DD.=)

=w.= Leaves irregularly serrate, somewhat straight-veined;
fruit single-winged; large cultivated tree 60. _Fraxinus._

=w.= Leaves neither heart-shaped nor lobed; small trees,
almost shrubs. (=x.=)

=x.= Leaves entire. (=z.=)

=x.= Leaves serrate or dentate, ovate or oval. (=y.=)

=y.= Fruit rounded drupes in large clusters, with single
flattened stones 47. _Viburnum._

=y.= Fruit lobed pods, which burst open in the autumn;
branchlets somewhat 4-sided 19. _Euonymus._

=z.= Leaves small, lanceolate; flowers and fruit large and
beautiful 42. _Punica._

=z.= Leaves broad, thin, with curved parallel veins or ribs.
45. _Cornus._

=z.= Leaves large, broad, oval, without either curved or
straight parallel ribs 63. _Chionanthus._

=AA.= Leaves entire and covered on both sides with
silvery, peltate scales 72. _Shepherdia._

=AA.= Leaves ovate, small, minutely serrate 20. _Rhamnus._

=BB.= Leaves large, 18 in. or more long; leaflets 11 or
more, very finely serrated 14. _Phellodendron._

=