Illustrations
In lieu of an abstract, here is a brief excerpt of the content:

IX Illustrations 1. Justicia americana 12 2. Justicia ovata 13 3. Acer drummondii 14 4. Acer negundo 15 5. Acer rubrum 17 6. Acer saccharinum 19 7. Alternanthera philoxeroides 20 8. Amaranthus rudis 22 9. Amaranthus tuberculatus 24 10. Iresine rhizomatosa 26 11. Toxicodendon radicans 27 12. Toxicodendron vernix 28 13. Angelica atropurpurea 31 14. Berula erecta 32 15. Cicuta bulbifera 33 16. Cicuta maculata 34 17. Conioselinum chinense 35 18. Cynosciadium digitatum 37 19. Eryngium integrifolium 38 20. Eryngium prostratum 38 21. Hydrocotyle americana 40 22. Hydrocotyle ranunculoides 40 23. Hydrocotyle sibthorpoides 41 24. Hydrocotyle umbellata 41 25. Hydrocotyle verticillata 42 26. Limnosciadium pinnatum 43 27. Oenanthe aquatica 45 28. Oxypolis rigidior 46 29. Ptilimnium capillaceum 47 30. Ptilimnium costatum 48 31. Ptilimnium nuttallii 49 32. Sium suave 51 33. Trepocarpus aethusae 52 34. Zizia aurea 52 35. Amsonia tabernaemontana 54 36. Trachelospermum difforme 55 37. Ilex decidua 57 38. Ilex opaca 59 39. Ilex verticillata 60 40. Nemopanthus mucronatus 61 41. Aralia nudicaulis 62 42. Aristolochia hastata 64 43. Aristolochia tomentosa 65 44. Asclepias incarnata 67 45. Asclepias perennis 68 46. Acmella oppositifolia 71 47. Ageratina aromatica 72 48. Arnoglossum plantagineum 74 49. Bidens aristosa 76 50. Bidens cernua 77 51. Bidens comosa 78 52. Bidens connata 79 53. Bidens coronata 81 54. Bidens discoidea 82 55. Bidens frondosa 83 56. Bidens laevis 84 57. Bidens polylepis 85 58. Bidens tripartita 86 59. Bidens vulgata 87 60. Boltonia asteroides 89 61. Boltonia decurrens 89 62. Boltonia diffusa 90 63. Brachyactis ciliata 91 64. Cirsium muticum 91 65. Conoclinium coelestinum 92 66. Doellingeria pubentior 94 67. Doellingeria umbellata 95 68. Eclipta prostrata 96 69. Eupatoriadelphus fistulosus 98 70. Eupatoriadelphus maculatus 99 71. Eupatorium hyssopifolium 100 72. Eupatorium perfoliatum 102 73. Eupatorium semiserratum 102 74. Euthamia graminifolia 104 75. Euthamia leptophylla 105 76. Fleischmannia incarnata 106 77. Hasteola suaveolens 107 78. Helenium autumnale 108 79. Helenium flexuosum 109 80. Helianthus angustifolius 111 81. Helianthus giganteus 112 82. Helianthus grosseserratus 113 83. Helianthus tuberosus 113 84. Liatris spicata 115 85. Megalodonta beckii 115 86. Melanthera nivea 116 87. Mikania scandens 118 88. Oligoneuron ohiense 119 89. Oligoneuron riddellii 119 90. Packera aurea 121 X / ILLUSTRATIONS 91. Packera glabella 122 92. Pluchea camphorata 123 93. Pluchea foetida 124 94. Prenanthes racemosa 125 95. Rudbeckia fulgida 127 96. Rudbeckia laciniata 129 97. Silphium perfoliatum 131 98. Solidago gigantea 132 99. Solidago patula 133 100. Solidago rugosa 135 101. Solidago uliginosa 136 102. Symphyotrichum boreale 138 103. Symphyotrichum dumosum 139 104. Symphyotrichum firmum 140 105. Symphyotrichum lanceolatum 141 106. Symphyotrichum lateriflorum 143 107. Symphyotrichum novae-angliae 143 108. Symphyotrichum praealtum 144 109. Symphyotrichum prenanthoides 146 110. Symphyotrichum puniceum 147 111. Symphyotrichum racemosum 148 112. Verbesina alternifolia 149 113. Vernonia arkansana 151 114. Vernonia fasciculata 152 115. Vernonia missurica 153 116. Vernonia noveboracensis 154 117. Impatiens capensis 155 118. Impatiens pallida 156 119. Alnus rugosa 158 120. Alnus serrulata 160 121. Betula nigra 161 122. Betula papyrifera 163 123. Betula pumila 165 124. Bignonia capreolata 166 125. Campsis radicans 167 126. Catalpa speciosa 169 127. Heliotropium indicum 170 128. Myosotis laxa 171 129. Myosotis scorpioides 172 130. Cardamine douglasii 174 131. Cardamine parviflora 176 132. Cardamine pensylvanica 177 133. Cardamine rhomboidea 179 134. Cardamine rotundifolia 180 135. Nasturtium microphyllum 181 136. Nasturtium officinale 182 137. Neobeckia aquatica 184 138. Rorippa curvipes 185 139. Rorippa palustris 187 140. Rorippa sessiliflora 188 141. Rorippa sinuata 190 142. Rorippa sylvestris 191 143. Rorippa tenerrima 192 144. Rorippa truncata 193 145. Brasenia schreberi 195 146. Cabomba caroliniana 196 147. Gleditsia aquatica 198 148. Callitriche hermaphroditica 199 149. Callitriche heterophylla 200 150. Callitriche verna 201 151. Campanula aparinoides 203 152. Campanula uliginosa 204 153. Lobelia cardinalis 206 154. Lobelia kalmii 207 155. Lobelia puberula 208 156. Lobelia siphilitica 210 157. Lobelia spicata 211 158. Lonicera canadensis 213 159. Lonicera dioica 213 160. Lonicera oblongifolia 214 161. Lonicera villosa 215 162. Sambucus canadensis 217 163. Sambucus racemosa 217 164. Viburnum cassinoides 218 165. Viburnum nudum 219 166. Viburnum opulus 220 167. Viburnum recognitum 221 168. Viburnum trilobum 222 169. Myosoton aquaticum 224 170. Sagina fontinalis 225 171. Stellaria longifolia 227 172. Ceratophyllum demersum 228 173. Ceratophyllum echinatum 229 174. Calystegia sepium 231 175. Cornus amomum 232 176. Cornus foemina 234 177. Cornus obliqua 234 178. Cornus sericea 235 179. Carpinus caroliniana 237 180. Cuscuta cephalanthi 239 181. Cuscuta compacta 241 182. Cuscuta glomerata 242 183. Cuscuta polygonorum 243 184. Drosera brevifolia 245 185. Drosera intermedia 246 186...