UNIVERSITY OF MISSOURI STUDIES 



[i6o 



Lobelia syphilitica 



Ludoviciana 

 Iva xanthifolia 

 I. axillaris 

 Ambrosia trifida 

 Xanthium commune 

 Aster caerulescens 



A. Osterhoutii 

 Bidens vulgata 



B. glaucescens 

 Helenium montanum 

 Lactuca pulchella 



L. spicata 



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 



Eatonia robusta 



Agropyron riparium 



Elymus Canadensis 



E. robustus 



Populus Sargentii 



P. acuminata 



P. angustifolia 



Salix amygdalioides 



S. exigua 



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 



Betula fontinalis (only near 



the foot-hills) 

 Urtica gracilis 

 Cardamine vallicola 

 Rulac Negundo 

 R. Texanum 

 Vitis vulpina 

 Pesedera vitacea 

 Solidago Pitcheri 

 S. Canadensis 



