MISSOURI BOTANICAL GARDEN BULLETIN 29 
appearance of certain species of plants and the appearance 
of others new to the locality. Large portions of the original 
forest have been cut out to be replaced by farms. The wooded 
slopes of ravines have been denuded, and erosion of the soil 
has taken with it, in some cases, all of a certain species of 
plants. Railroads have brought about entirely new condi- 
tions, causing the disappearance of some plants and_ the 
appearance of many others. Floods have taken and brought 
species of plants within our local territory. Pasturing has 
denuded large areas of herbaceous vegetation, and not a few 
plants have, at least partly, been eliminated by thoughtless 
persons who have removed them from their native habitat, 
pulling them out by the roots from the loose soil in the woods 
and attempting to grow them in unsuitable positions in 
gardens and yards. 
The following list is based on the reports on local plants 
by the botanists who have collected in this vicinity from about 
the time of the arrival in St. Louis of Dr. George Engelmann, 
in 1835. Practically every species mentioned is to be found 
in the herbarium of the Garden, an indisputable evidence of 
its former existence in this locality. The following species 
may still perhaps be found in some little-explored or inac- 
cessible locality, but their discovery is very doubtful: 
Caulophyllum thalictroides, Cheilanthes lanosa, Cimicifuga 
racemosa, Collinsia verna, Commelina hirtella, Corallorhiza 
maculata, Festuca elatior, Gentiana Andrewsii, Hypericum 
petiolatum, Lilium philadelphicum, Monotropa Hypopitys, 
Salvia lyrata, Selaginella rupestris, and Stenanthemum 
angustifolia. 
