[Vor. 3 
358 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Some high hills near Prosperity and Duenweg, partly cov- 
ered with deposits of Lafayette gravel, have a somewhat 
charaeteristie flora, although few, if any, of the species are 
peculiar to them. Antennarias are a conspicuous feature of 
the spring vegetation, and it is probable that one or more 
undescribed species occur here. Other plants that may be 
mentioned are Panicum depauperatum, P. Werneri, Carex 
umbellata, C. Meadii, Fimbristylis castanea, var. puberula, 
Stipa spartea, Viola pedata, var. lineariloba of which a white 
form is frequent, V. sagittata, Lithospermum canescens, Sene- 
cio plattensis, and Marshallia caespitosa. 
Introduced plants, while quite numerous, do not as yet 
form a large percentage of the flora, but their invasion is 
steadily increasing, especially in the western part of the 
county where many railroads enter. Grasses and common 
weeds form the bulk of these emigrants. These flourish 
largely in waste places and in cultivated ground, and their 
distribution has little definite relationship to the native 
plants. Among species of recent introduction a few show a 
tendency to become wide-spread. Lespedeza striata is be- 
coming common in dry rocky woods, and the white-flowered 
sweet clover, Melilotus alba, is frequently found along road- 
sides and railroads. The sand burr, Solanum rostratum, has 
in recent years become quite common in ballast or waste 
ground, but it shows little tendency to spread beyond such 
situations. Helenium tenuifolium is beginning to appear 
along railroads and bids fair to become a nuisance. Perilla 
frutescens is established at several stations and, judging by 
the rapidity with which it has spread in the bottoms of many 
Ozark streams, is likely to become common. Perhaps most 
pernicious of all is the Johnson grass, Sorghum halepense, 
which is established in a number of low fields. 
From a study of the above and the following list it will 
be seen that the flora of Jasper County is a diverse and com- 
posite one. The plants of the near plains are perhaps the 
dominant element and the most striking feature, but mingled 
with them are a number of types of the northeastern states, 
