SHRUBS. 



158. Bristly or with sticky glands. 

 Neither bristly nor sticky. 159. 



159. VERY POISONOUS. Sap milky. 

 Sap not milky. 160. 



160. Leaves with terminal leaflet. 161. 

 Leaves without terminal leaflet. 



161. Leaflets short and broad. 162. 

 Leaflets narrow, silky : plant low. 



162. Leaflets very small (under I cm.), sessile. 

 Leaflets larger (1.5 cm.), distinctly stalked. 



163. Leaves with nectar-glands on the teeth. 

 Without nectar-glands. 164. 



164. Leaf-scar nearly encircling the bud. 

 Leaf-scar not encircling the bud. 165. 



165. Rachis or axis of the leaf broadly winged. 

 Rachis not winged between the leaflets. 166. 



166. Leaf-scars narrow, half encircling the twig. 

 Leaf-scars broad. 168. 



167. More or less tree-like : buds large. 

 Bushy: buds small. 



168. Leaf-scars elevated : large shrub. 

 Leaf-scars scarcely raised : low shrub. 



169. Aromatic, with glandular hairs: small. 

 Not aromatic, or else large. 170. 



170. Leaf-scar nearly encircling the bud. 

 Leaf-scar not encircling the bud. 171. 



171. Stem very stout: buds large. 

 Stem and buds moderate. 172. 



172. Leaf-scars nearly encircling the twig. 

 Leaf-scars not encircling the twig. 173 

 Very slender, often with tendrils. 

 Stouter: leaflets small. 



Coarse: leaflets moderately large. 



Leaves opposite. 

 Leaves simple. 175. 



29 

 Robinia. 



Rhus (Toxicodendron). 



Caragana. 



Potentilla. 



Calophaca. 



Colutea. 



Ailanthus. 



Rhus. 



Rhus. 



167. 



173 



Sorbus. 

 Rosa. 



Xanthoceras. 

 Sorbaria. 

 Chamaebatiaria. 



Rhus. 

 Paeon ia. 

 Zanthorhiza. 



Ampelopsis. 

 Gleditsia. 

 Rhus. 



174. 



Leaves compound. 226. 



