xxvi 
222. 
223. 
225. 
226. 
227. 
228. 
229. 
230. 
231. 
232. 
233. 
234. 
235. 
KEYS—LEAVES ALTERNATE 
Evergreen: leaflets numerous. p. 56. Nandina. 
Deciduous or else without many leaflets. 223. 
Petiole sometimes elongated: deciduous. p.117. Potentilla. 
Petiole not elongated: subevergreen. p. 60. * Mahoberberis. 
. 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. 
Evergreen, with small finely compound leaves. 226. 
Leaves not small and fern-like if evergreen. 227. 
Leaves scarcely twice pinnate. p. 96. Chamaebatiaria. 
Leaves nearly thrice pinnate. p. 122. Chamaebatia. 
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. 
Stipule-scars encircling the twig. p. 63. Magnolia. 
Stipule-scars, if any, not encircling the twig. 229. 
Leaf-scars fully half-encircling the twig. 230. 
Leaf-scars shorter. 231. 
Evergreen: leaves pinnately compound. p.59. Mahonia. 
Deciduous: twigs yellow when cut. p. 51. Zanthorhiza. 
Bud-seale distinctly 1, forming a sac. p.11. Salix 
Bud-scales several or else indistinct. 232. 
Pith spongy: buds acute. p. 82. Ribes. 
Pith chambered: buds obtuse. p. 125. Osmaronia. 
Pith continuous. 233. 
Aromatic: twigs slender: buds superposed. p. 72. Benzoin. 
Without this combination of characters. 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. 
Buds imbedded in gum or resin. 236. 
Buds not resinous, fleshy. p. 111. Crataegus. 
