28 



WOODY PLANTS 



197. Bundle-traces many, not in 3 groups. 198 



197. Bundle-trace one. 208 



198. Leaf-scars large; bundle-traces in an ellipse. . . Ampelopsis, p. 147 



198. Not as above. 199 



199. Sap milky. 200 



199. Sap not milky. 203 



200. With stipule-scars. 201 



200. Without stipule-scars. . . Rhus , p. 131 



201. Pith with thin plates at the nodes. . . Broussonetia, p. 87 



201. Not as above. 202 



202. Buds ovoid. . . Morus, p. 87 



^02. Buds depressed-globose. . . Madura, p. 89 



203. Pith ang-^alar, more or less star-shaped. 204 



203. Pith roiond or nearly so. 205 



204. Bud-scales numerous. . . Quercus, p. 74 



204. Bud-scales 2 or 3 . . . Castanea, p. 73 



205. Buds evident. 206 



205. Buds not evident. . . Hibiscus, p. 153 



206. Buds asymmetrical. . . Tilia, p. 151 



206. Buds nearly symmetrical. 207 



207. Scars of 2 kinds, viz. , leaf-scars with 3 bundle -traces, and 

 branch-scars with numerous bundles in an ellipse. . . PsT'ularia, p. 89 



207. Not as above. . . Corylus, p. 67 



208. Leaf-scars minute, on small ridges; twigs bearing cones 

 persistent in winter. . . Larix, p. 35 



208. Not as above. 209 



209. Pith chambered or porous. 210 



209. Pith continuous. 212 



210. Bud-scales 2. overlapping. .. Diospyros , p. 178 



210. Bud-scales several. 211 



211. Buds deltoid. . . Celtis , p. 85 



211. Buds ovoid. . . Halesia, p. 178 



212. Bundle-trace broken into three. 213 



212. Bundle-trace unbroken. 215 



213. Twigs aromatic, green. . . Sassafras, p. 98 

 213. Not as above. 214 



