INDEX TO THE GENERA 



The numbers i-efer to the list numbers at the left of the species 

 names. A few familiar synonyms have been included. 



Abutilon, 828 

 Acalypha, 793 

 Acer, 1229 

 Aeerates, 1480 

 Achillea, 1989 

 Acnida, 946 

 Aconitum, 630 

 Acorus, 122 

 Aetaea, 645 

 Aciian, 1094 

 Adiautum, 16 

 Adlumia, 676 

 Aegopodiuni, 1733 

 Aesculus, 1226 

 Aethusa, 1728 

 Afzelia, 1.5.51 

 .'Vgalinis, 1556 

 Agastache, 1662 

 Agave, 555 

 Agrimonia, 1046 

 Agropyron, 363 

 Agrostemma, 905 

 Agrostis, 390 

 Ailanthns, 782 

 Ajuga, 1617 

 Aletris, 490 

 Alisma, 82 

 Alliaria, 705 

 Allionia, 933 

 Allium, 482 

 Alnus, 1286 

 Alopeciiriis, 396 

 Alsine, 894 

 Althaea, 823 

 Alyssum, 684 

 Amaranthus, 941 

 Ambrosia, 1826 

 Amelanchier, 1061 

 Ammannia, 1194 

 .Ammophila, 395 



Amorpha, 1127 

 Ampelopsis, 1214 

 Amygdalus, 1093 

 Anagallis, 1380 

 Anajjhalis, 1895 

 Anchistea, 19 

 Andromeda, 1400 

 Andropogon, 469 

 Anemone, 634 

 Angelica, 1717 

 Anisostichus, 1577 

 Antennaria, 1896 

 Anthemis, 1990 

 Anthoxanthum, 417 

 Anticlea, 497 

 Antirrhinum, 1565 

 Anychia, 938 

 Apargia, 2036 

 Apera, 393 

 A pi OS, 1]75 

 Apium, 1726 

 Aplectrum, 598 

 Apocynum, 1476 

 Aquilegia, 628 

 Arabidopsis, 716 

 Arabis, 721 

 Aralia, 1698 

 Arctium, 2017 

 Arctostaphylos, 1404 

 Arenaria, 889 

 Arethusa, 584 

 Argemone, 669 

 Argentina, 1014 

 Arisaema, 126 

 Aristida, 410 

 Aristolochia, 1368 

 Armoriea, 691 

 /* ruoseris, 2034 

 Aronia, 1058 

 Arreuathcinim, 352 



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