Rocky Mountain Rambles. 



157 



ing the usual aquatic plants, like the Scirpus validus, Phracj- 

 mites communis, Typha latijolia, Phalaris arundinacea, and oc- 

 casionally the Zi2ania aquatica. These same species are quite 

 as common in the Missouri Valley as in the Mississippi, and also 

 in the Rockies, except the wild rice. There is also an additional 

 species of cat-tail in the Rocky Mountain region near Denver, 

 the Typha angustifolia. 



The trees of the Des Moines basin are generally similar 

 in species to those found along the Mississippi in the same 



Fig. 2. Vegetation on the banks of Black's Fork in the Uintah Mountains at 

 an altitude of 9200 feet. The herbaceous plants are Erigeron glabellus, 

 Canadian Peppermit {Mentha canadensis), and False Quack (Agropyron^ 

 pseudorepens) . 



latitude, but there are not so many. The Des Moines basin 

 marks the western limit of the hard maple {Acer nigrum) in 

 Iowa. Of the deciduous trees, the oaks are much the same as 

 in Wisconsin and Minnesota. The Quercus rubra is much more 

 common than the white oak, while the bur oak seems to have 

 been able to occupy virgin soil in the region, and is the only 

 species reaching northwest in Iowa. Old gnarled trees between 



