xxvi KEYS LEAVES ALTERNATE 



222. Evergreen: leaflets numerous. p. 56. Nandina. 

 Deciduous or else without many leaflets. 223. 



223. Petiole sometimes elongated: deciduous, p. 117. Potentilla. 

 Petiole not elongated: subevergreen. p. 60. X Mahoberberis. 



224. Bundle-traces 3 or more, separate, in an open line. 225. 

 Bundle-trace 1; or many traces scattered or in an ellipse, 



or nearly confluent in a straight or curved line. 344. 

 (This group includes cases in which the bundle-traces 

 are indistinguishable in a shriveled scar). 

 Caution. Learn the poisonous species of Rhus. 



225. Evergreen, with small finely compound leaves. 226. 

 Leaves not small and fern-like if evergreen. 227. 



226. Leaves scarcely twice pinnate. p. 96. Chamaebatiaria. 

 Leaves nearly thrice pinnate. p. 122. Chamaebatia. 



227. Leaf-scars linear or narrowly U-shaped. 228. 

 Leaf-scars C-shaped or horseshoe-shaped, or ring-like 



and encircling the bud. 248. 

 Leaf-scars not of the preceding types. 255. 



228. Stipule-scars encircling the twig. p. 63. Magnolia. 

 Stipule-scars, if any, not encircling the twig. 229. 



229. Leaf-scars fully half-encircling the twig. 230. 

 Leaf-scars shorter. 231. 



230. Evergreen: leaves pinnately compound, p. 59. Mahonia. 

 Deciduous: twigs yellow when cut. p. 51. Zanthorhiza. 



231. Bud-scale distinctly 1, forming a sac. p. 11. Salix 

 Bud-scales several or else indistinct. 232. 



232. Pith spongy: buds acute. p. 82. Ribes. 

 Pith chambered: buds obtuse. p. 125. Osmaronia. 

 Pith continuous. 233. 



233. Aromatic: twigs slender: buds superposed, p. 72. Benzoin. 

 Without this combination of characters. 234. 



234. Buds round-ovoid with resinous or fleshy scales. 235. 

 Buds usually indistinct: bark green. p. 142. Cercidium. 

 Without either of these combinations of characters. 237. 



235. Buds imbedded in gum or resin. 236. 



Buds not resinous, fleshy. p. 111. Crataegus. 



