12 UNIVERSITY OF MISSOURI STUDIES [l6o 



Lobelia syphilitica A. Osterhoutii 



Ludoviciana Bidens vulgata 



Iva xanthi folia B. glaucescens 



I. axillaris Helenium montanum 



Ambrosia trifida Lactuca pulchella 



Xanthium commune L. spicata 

 Aster caerulescens 



It will be noted that all but a very few of the above 

 species are common palustrous species of the eastern United 

 States. 



c. Ripariae. The Riparian Flora occurs along the banks 

 of streams. It consists of trees, shrubs, and herbs. There 

 are no trees nor shrubs proper on the Great Plains, except 

 those that grow along the streams. Here occur various cot- 

 tonwoods, box-elders, and willows. The herbs are partly 

 marsh herbs and partly plants from the plains, especially 

 grasses. The following are typical riparian species : 



Equisetum laevigatum Betula fontinalis (only near 



Eatonia robusta the foot-hills) 



Agropyron riparium Urtica gracilis 



Elymus Canadensis Cardamine vallicola 



E. robustus Rulac Negundo 



Populus Sargentii R. Texanum 



P. acuminata Vitis vulpina 



P. angusti folia Pesedera vitacea 



Salix amygdalioides Solidago Pitcheri 



S. exigua S. Canadensis 



S. luteosericea 



d. Campanales. The Prairie Flora is that which is 

 proper to the greater part of the plains region. In aspect it 

 is a vast meadow, above which now and then a yucca rises with 



