296 SYMBIOTIC NITROGEN FIXATION 



Slender bush clover, Lespedeza virginica. 

 Velvet bean, Mucuna utilis. 

 Wild indigo, Baptisia tinctoria. 

 Tick trefoil, Desmodium canescens. 

 Tick trefoil, Desmodium illinoense. 

 Acacia, Acacia armata. 

 Acacia ; Acacia floribunda. 

 Acacia, Acacia longifolia. 

 Acacia,^4cocm melanoxylon. 

 Acacia, Acacia semperflora. 

 Acacia, Acacia from California. 

 Dyer's greenweed, Genista tinctoria. 



GROUP IV. 



Common garden pea, Pipsum sativum. 



Field pea, or Canada field pea, Pisum sativum arvense. 



Hairy vetch, Vicia mllosa. 



Spring vetch, Vicia sativa. 



Broad bean, Vicia faba. 



Narrow-leaved vetch, Vicia angustifolia. 



Vetch, Vicia daysiecarpa. 



Lentil, Lens escuknta. 



Sweet pea, Lathyrus odoratus. 



Perennial pea, Lathyrus latifolius. 



GROUP V. 

 Soybean, Glycine hispida. 



GROUP VI. 



Garden bean, Phaseolus vulgaris. 

 Garden bean, Phaseolus angustifolia. 

 Scarlet runner bean, Phaseolus multiflorus. 



GROUP VII. 



Lupine, Lupinus perennis. 

 Serradella, Ornithopus sativus. 



GROUP VIII. 

 Hog peanut, Amphicarpa monoica. 



GROUP IX. 

 Lead plant, Amorpha canescens. 



