12 



UNIVERSITY OF MISSOURI STUDIES 



fi6o 



Lobelia syphilitica 



Ludoviciana 

 Iva xanthi folia 

 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. angusti folia 

 Salix amygdalioides 

 S. exigua 



Betula fontinalis (only near 



the foot-hills) 

 Urtica gracilis 

 Cardamine vallicola 

 Rulac Xegundo 

 R. Texanum 

 Vitis vulpina 

 Pesedera vitacea 

 Solidago Pitcheri 

 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 



