INDEX TO GENERA. 
Acanthns, 139. 
Achillea, 122. 
Achyranthes, 144. 
Acrostichum, 175. 
Adenostyles, 123. 
Adiantum, 170, 
Agave, 152. 
Agrimonia, 111. 
Agropyron, 169, 
Agrostis, 161, 207, 208, 209. 
Aichryson, (112). 
Aira, 164. 
Alchemilla, 111. 
Alisma, 155. 
Allantodia, (173). 
Allium, 152, 207. 
Alsine, (99). 
Alternanthera, 144. 
Alyssum, 94, 
Amaranthus, 144. 
Amaryliis, 152, (152). 
Amblystegium, (177). 
Ammi, 115. 
Amphora, 194. 
Anabaena, 198. 
Anagallis, 130. 
Androsaemum, (100). 
Anethum, (117). 
Aneura, (187). 
Angelica, 117. 
Ankistrodesmus, (1295.) 
Anomobryum, 180. 
Anthemis, 122. 
Anthoceros, 185. 
Anthoxanthum, 160, 
Antirrhinum, 136. 
Apium, 115, (116), 210. 
Aquillegia, 92. 
Archidium, 184. 
Arenaria, 98, (98), (99). 
Argyranthemum, (123). 
Arisarum, 155, 
Arrhenatherum, 164. 
Arthrodesmus, 195. 
Arthrolobium, (108), 
Arum, 155, (155). 
Arundo, (164), 165, 210, 
Asclepias, (132). 
Ascophyllum, 192. 
(Synonyms in parenthesis.) 
Aspera, (119.) 
Aspidium, (170), 173. 
Asplenium, 172. 
Asterella, 188. 
Astrodontium, 179. 
Astrolobium, (108). 
Athyrium, (173). 
Atrichum, 180. 
Atriplex, 145. 
Avena, 164, (164), (165). 
Ballota, 142. 
Barbaraea, 94. 
Barbula, 182, 
Bartramia, 179, (181). 
Bartsia, 138. 
Batatas, (134). 
Bazzania, 186. 
Bellis, 120. 
Beta, 145. 
Bidens, 122. 
Blechuum, (171). 
Botryococcus, 195. 
Boussingaultia, 62, 146, 147. 
Bovista, 206, 
Brachypodium, 168. 
Brachythecium, 179. 
Brassica, 94. 
Breutelia, 181. 
Briza, 166. 
Bromas, 167. 
Bryophyllum, 111. 
Bryopsis, 197. 
Bryum, 180, (181), 182. 
Buellia, 205, 
Bulbochaete, 198. 
Buxus, 149, 207. 
Cakile, 95. 
Caladium, (155). 
Calamintha, 141. 
Calendula, 124. 
Calla, (155). 
Callithamnion, 190, (190). 
Callitriche, 112. 
Calluna, 129. 
Calypogeia, (186). 
Calystegia, 134. 
Campanula, 128. 
(215) 
