xxxii KEYS LEAVES ALTERNATE 



319. Leaf-scars somewhat 3-lobed. p. 132. Albizzia. 

 Leaf-scars not lobed. p. 218. Hovenia. 



320. Twigs warty: bud-scales fringed. p. 211. Xanthoceras. 

 Without this combination of characters. 321. 



321. Twigs warty: end-bud lacking. p. 126. Maddenia. 

 Without this combination of characters. 322. 



322. Stipules persistent: leaf-scars raised. p. 148. Laburnum. 

 Stipules lacking: leaf-scars raised. p. 109. Photinia. 

 Without eithe'r of these combinations of characters. 323. 



323. Pith 5-sided: twigs often corky-ridged, p. 85. Liquidambar. 

 Pith not sharply 5-angled. 324. 



324. Leaf-scars often 2-ranked. 325. 

 Leaf-scars in more than 2 ranks. 332. 



325. Bud-scales several pairs in 2 ranks. 326. 

 Bud-scales not evidently in 2 ranks. 328. 



326. Bud-scales acute. . p. 41. Aphananthe. 

 Bud-scales obtuse. 327. 



327. Buds ovoid, moderate or else twigs gray. p. 38. Ulmus. 

 Buds round, small: twigs cherry-colored. p. 39. Planera. 



328. End-bud present. p. 89. Corylopsis. 

 End-bud lacking. 329. 



329. Bud-scales striate: bark of trunk scaly, p. 22. Ostrya. 

 Without this combination of characters. 330. 



330. Bud-scales 2. p. 226. Tilia. 

 Bud-scales about half-a-dozen. 331. 



331. Buds nearly globose: twigs often bristly, p. 20 Corylus. 

 Buds ovoid: not bristly: tree. p. 21. Carpinus. 



332. Visible bud-scales two. 333. 



Exposed-scales more than two or buds naked. 334. 



333. Scales valvate: end-bud present. p. 262. Cornus. 

 Scales overlapping: end-bud lacking. p. 144. Cladrastis. 



334. Without stipules or stipule-scars. 335. 



With stipule-scars or persistent stipules. 338. 



335. Aromatic: twigs green, mucilaginous. p. 71. Sassafras. 

 Not aromatic. 336. 



