Keys Leaves Axtebnati zxii! 



176. Only the stipules pungent. 177. 



Pungent leaves also present. See 146. 



Pungent twigs also present. See 181. 



Prickles also present. See 186. 

 L77. Leaf-scars on a finally torn membrane. p. 157. Robinia. 



Leaf-scars small, not on an articular membrane. 178. 

 78. Bundle-trace one. 179. 



Bundle-traces 3: fruit a screw-like pod. p. 135. Prosopis. 

 l79. Slender branchlets from the nodes: fruit fleshy. 



p. 212. Zizyphus. 



Without this combination of characters. 180. 

 .80. Leaf-scars low: fruit umbrella-shaped. p. 213. Paliurus. 



Leaf-scars raised: fruit a legume. p. 133. Acacia. 



81. Wood appearing "endogenous": a supra-axillary 



spine present, p. 46. Bougainvillea. 



Wood distinctly in a zone between pith and bark. 182. 

 .82. Pith chambered or excavated. p. 131. Prinsepia. 



Pith spongy: spine by side of bud. p. 235. Lycium. 



Pith continuous. 183. 

 L83. Aromatic: evergreen or with green twigs. 184. 



Not aromatic: evergreen: leaves simple, p. 99. Pyracantha. 



Neither aromatic nor evergreen nor green-twigged. 186. 

 L84. Deciduous: spines strong. p. 169. Poncirus. 



Evergreen: leaves compound. 185. 

 L85. Leaflets 3: spines needle-like. p. 167. Triphasia. 



Leaflet 1, but disarticulating from its stalk, p. 168. Citrus. 

 . Sap more or less milky. 187. 



Sap not milky. 188. 

 87. Without stipule-scars: bundle-traces 



With stipule-scars: bundle-traces more. 

 L88. Leaf-scars on finally torn membranes. 



Without such articular membranes. 

 189. Spines branched, often clustered. 



Spines unbranched. 



