KEYS LEAVES ALTERNATE xxxiii 



336. Buds with red fleshy scales. p. 111. Crataegus. 

 Bud-scales not fleshy. 337. 



337. Buds woolly or gummy: no catkins. p. 106. Sorbus. 

 Buds not woolly or gummy. p. 14. Leitneria. 



338. Stipule-scars rather elongated. 340. 

 Stipule-bases present, or their scars short. 339. 



339. Stipule-scars or bases on a leaf-cushion, p. 127. Prunus. 

 Stipule-scars not on a leaf-cushion. 341. 



340. Pith round: buds often superposed. p. 92. Neillia. 

 Pith 3-sided: buds not superposed. p. 23. Betula. 



341. Leaf-scars somewhat raised. p. 242. Stachyurus. 

 Leaf-scars low. 342. 



342. Buds nearly globose. p. 150. Amorpha. 

 Buds ovoid. 343. 



343. Bundle-traces confluent or twigs hairy. p. 220. Rhamnus. 

 Bundle-traces separate or twigs glabrous, p. 127. Prunus. 



344. Stipule-scars nearly or quite encircling the twig. 345. 

 Stipule-scars not nearly encircling the twig. 349. 



345. Buds pointed and spike-like. p. 27. Fagus. 

 Buds not sharp and hard. 346. 



346. Sap milky. p. 37. Ficus. 

 Sap not milky. 347. 



347. Very rusty-hairy. p. 64. Michelia. 

 Without long rusty hairs. 348. 



348. Buds terete. p. 63. Magnolia. 

 Buds flattened. p. 62. Liriodendron. 



349. Leaf-scar nearly encircling the twig after the 



petiole has fallen. p. 121. Purshia. 



Leaf-scar not at all nearly encircling the twig. 350. 



350. Bundle-traces 3: pith chambered. p. 19. Pterocarya. 

 Without this combination of characters. 351. 



351. Bundle-traces many, mostly in 3 groups: leaf-scars 



lobed. 352. 

 Without this combination of characters. 358. 



