xxviii KEYS—LEAVES ALTERNATE 
253. 
254. 
255. 
256. 
257. 
258. 
259. 
260. 
261. 
262. 
263. 
264. 
265. 
266. 
267. 
268. 
269. 
With small stipules or stipule-scars. 254. 
Without stipules or stipule-scars. p. 139. Gleditsia. 
Nodes usually swollen: buds distinct. p. 143. Sophora. 
Nodes neither swollen nor buds large. p. 157. Robinia. 
Leaf-scars enlarged on trunk: sap milky. p. 243. Carica. 
Without this combination of characters. 256. 
Pith spongy between the nodes. 257. 
Pith chambered, at least at some nodes. 259. 
Pith continuous. 262. 
Leaf-scars 2-ranked. p. 40. Zelkova. 
Leaf-scars in more than 2 ranks. 258. 
Lowest bud-seale in front. , p. 9. Populus. 
Scales otherwise disposed. p. 85. Liquidambar. 
Buds naked: bundle-traces large. p. 19. Pterocarya. 
Buds scaly. 260. 
Twigs coarse: leaf-scars large. p. 16. Juglans. 
Twigs slender: leaf-scars small. 261. 
Buds triangular, appressed, solitary, 2-ranked. p. 39. Celtis. 
Buds ‘globose, superposed: twigs green. p. 80. Itea. 
Pith with firmer plates at intervals. 263. 
Pith without firmer diaphragms. 266. 
Evergreen: very rusty-hairy. p. 64. Michelia. 
Deciduous. 264. 
Buds solitary or not forming spurs. p. 266. Davidia. 
Buds superposed or else forming dwarf branches. 265. 
Buds with scales, not red-hairy. p. 265. Nyssa. 
Buds red-hairy, the terminal without scales. p. 68. Asimina. 
Evergreen or largely so. 267. 
Deciduous. 281. 
Leaves compound. 268. 
Leaves simple. 274. 
Peppery-aromatic. p. 185. Schinus. 
Not peppery. 269. 
Buds superposed. p. 208. Sapindus. 
Buds not superposed. 270. 
