IOWA ACADEMY OF SCIENCE 
127 
Amaranthus retroflexus L. 7 
Ambrosia artemisiaefolia L 74 
Ambrosia trifida L 74 
Ambrosia trifida integrifolia (Muhl.) T. & G. 74 
Amphicarpa — see Faleata. 
Amorpha canescens L ......... 97% 
Amygdalus persica L 2, 16, 18, 56 
Anemone virginiana L. 118 
Anemonella — see Syndesmon. 
Antennaria plantaginifolia (L.) 'Richards 33 
Apios tuberosa Moeneh 92 
Arisaema dracontium (L.) Schott. . 89 
Arisaema triphyllum (L.) Torr 89 
Ascelpias syriaca L 64, 94, 148 
Asparagus officinale L 98 
Aster cordifolius Tj. 134 
Aster diffiusus Ait. 31, 127 
Aster laevis L. 132, 134 
-Aster saggitifolms Willd 132 
Astragalus carolinianus L 73 
Aviena satim L. 99, 104, 152 
Berberis vulgaris L. 104 
Beta vulgaris L 59 
Bidens frondosa L 68 
Bidens involucrata (Nutt.) Britt 68 
Brassica nigra (L.) Koch 73 
Brassica oleracea 1 
Bursa bursa-pastor is (L.) Britt 6, 13 
Carduus discolor (Muhl.) Nutt 74 
Carex spp 101 
Oatalpa speciosa Warder 78 
Cercis canadensis L 53 
Chaetochloa glauca (L.) Scribn 154 
Circaea lutetiaina L 100 
Clematis virginiana L 73 
Cochlear ia armoraeia L 6 
Comandra umbellata (L.) Nutt , 144 
Convolvulus siepium L 102 
Oorylus americana L 77 
Crataegus tomentosa L 121 
Cueumus sativus L 4 
