xxviii Keys Leaves Alternate 



253. With small stipules or stipule-scars. 254. 



Without stipules or stipule-scars. p. 139. Gleditsia. 



254. Nodes usually swollen: buds distinct. p. 143. Sophora. 

 Nodes neither swollen nor buds large, p. 157. Robinia. 



255. Leaf-scars enlarged on trunk: sap milky, p. 243. Carica. 

 Without this combination of characters. 256. 



256. Pith spongy between the nodes. 257. 



Pith chambered, at least at some nodes. 259. 

 Pith continuous. 262. 



257. Leaf-scars 2-ranked. p. 40. Zelkova. 

 Leaf-scars in more than 2 ranks. 258. 



258. Lowest bud-scale in front. p. 9. Populus. 

 Scales otherwise disposed. p. 85. Liquidambar. 



259. Buds naked: bundle-traces large. p. 19. Pterocarya. 

 Buds scaly. 260. 



260. Twigs coarse: leaf-scars large. p. 16. Juglans. 

 Twigs slender: leaf-scars small. 261. 



261. Buds triangular, appressed, solitary, 2-ranked. p. 39. Celtis. 

 Buds globose, superposed: twigs green. p. 80. Itea. 



262. Pith with firmer plates at intervals. 263. 

 Pith without firmer diaphragms. 266. 



263. Evergreen: very rusty-hairy. p. 64. Michelia. 

 Deciduous. 264. 



264. Buds solitary or not forming spurs. p. 266. Davidia. 

 Buds superposed or else forming dwarf branches. 265. 



265. Buds with scales, not red-hairy. p. 265. Nyssa. 

 Buds red-hairy, the terminal without scales, p. 68. Asimina. 



266. Evergreen or largely so. 267. 

 Deciduous. 281. 



267. Leaves compound. 268. 

 Leaves simple. 274. 



268. Peppery-aromatic. p. 185. Schinus. 

 Not peppery. 269. 



269. Buds superposed. p. 208. Sapindus. 

 Buds not superposed. 270. 



