LIST OF ILLUSTRATIONS XI 



FIGURE PACE 



127. Balloon Vine 199 



128. Butterprint 200 



129. Shoofly t 202 



130. St. John's Wort 203 



131. Evening Primrose 205 



132. Cowbane 206 



133. Water Hemlock 207 



134. Wild Carrot 208 



135. Milkweed 210 



136. Hedge Bindweed 212 



136a. Clover Dodder on Alfalfa 213 



136b. Field Dodder 214 



137. Hoary Vervain 218 



138. Dead Nettle 219 



139. Black Nightshade 220 



140. Horse Nettle 221 



140a. Purple Thorn Apple 223 



141. Toadflax 224 



142. Rugel's Plantain 226 



143. Buckhorn 227 



144. Bracted Plantain 228 



144a. Ironweed 230 



145. Whiteweed 232 



146. Horseweed 233 



147. Marsh Elder 234 



148. Small Ragweed 235 



148a. Young Plant of Smaller Ragweed 236 



149. Greater Ragweed . 237 



150. Young Cocklebur 238 



151. Sunflower 239 



152. Meadow Sunflower 240 



153. Young Plant Beggar-Ticks 241 



154. Beggar-Ticks 242 



154a. Ox-Eye Daisy 244 



155. Wormwood 245 



156. Fireweed 246 



157. Burdock 247 



158. Bull Thistle 248 



159. Canada Thistle 249 



160. Cat's Ear 251 



160a. Sow Thistle 252 



161. Prickly Lettuce 253 



