KEY TO THE GENERA OF TREES of 
i. Large tree, with fruit 1 in. in diameter, dry, rough, hanging 
O18 1ONg, SlOM i esceweiicmadees ae abe. Sema 41. Liquidambar. 
i, Small tree with few branches and the trunk usually quite 
prickly ; fruit berry-like in large clusters......... 44. Aralia. 
j. Fruit small berries, with 3 flattened seeds, in clusters in axils of 
leaves, which are decidedly 3-ribbed from base....21. Hovenia. 
j. Fruit small drupes, with 1 seed, either solitary or in pairs in 
the axils of the leaves. (k.) 
k. Plant without prickles; leaves decidedly oblique at base.... 
onlay daegai tats Magu pega ek Cah Dap ant can Memnaaceaia a hes Bach 76. Celtis. 
k. Plant with prickles; leaves narrow, decidedly 3-ribbed, and 
2-ranked on green twigs...........--..seeeeee. 22. Zizyphus. 
1, Fruit not very edible; leaves rough above, very hairy below, on 
some of the twigs opposite ................ .79. Broussonetia. 
1, Fruit edible; leaves not very hairy, never opposite. .78. Morus. 
m. Leaves of 3 entire-edged leaflets; fruit a pea-like pod. ... 
(AGES eeahee te wepmach as eG ke ctw otaneet te 28. Laburnum. 
m. Leaves of 5 leaflets; thorny .............0-. 000s 44. Aralia. 
m. Leaves of 3 quite regularly serrate, transparent-cotted 
Leahets: sie canaas ce ee Wiewn tana denn ata 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, pin- 
nate. (r.) 
n. Leaves regularly once pinnate. (0.) 
o. Leaves less than 1 ft. long, on a small, generally quite prickly 
plant; fruit very small pods (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 
sie inert ARGO MAROTAG (ER RA BEERS MMC A MONEAEG Fee 7B EN 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.) 
g. 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.......... 
SO PMR eeseeeg see PeMEeRee. gee Seder gk 17. Ailanthus. 
p. Leaflets entire at base, but very slightly serrate near the tip 
Soh ehh OIs $4 pd Se Te Ves ee BaEaeNe ees Fee -16. Cedrela. 
