Geological Surface Features of Sauk County. 515 
ter of soil and as a consequence also in the vegetative forms 
prevailing over the area of these steps. 
The species mentioned as typical for each group have been 
chosen with reference to this locality only, but comparison with 
notes taken in other parts of the state make me feel confident 
that elsewhere similar environments will allow us to establish 
corresponding vegetative groups coinciding with the above in 
their leading forms. 
In order to allow a more detailed comparison of the flora of 
this region with others, I append a list of all the indigenous 
and introduced plants that I have found here existing without 
or contrary to the wishes of man. I call attention to the rare 
and local Sullivantia Ohionis, and also to the fact that Salsola 
kali tragus appeared here in 1890, but in a single specimen 
only, which was transferred to my herbarium. None have been 
noticed since that time. 
