=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 (¼ 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 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._