194 MISSOURI BOTANICAL GARDEN. 



nopoda may sometimes be found. Other, rarer, species were 

 found here by Dr. Engelmann. The fall aspect does not differ 

 greatly from the summer aspect, Ranunculaceae and Cruci- 

 ferae disappear as do the various sedges. On the other 

 hand Aster salicifolius and Lobelia cardinalis at this time reach 

 their greatest development. 



Lakes. 



So ample an account has been given of the lakes of the 

 American Bottom by Coulter* that it is unnecessary to de- 

 scribe them here. It will isuffice to point out some of the 

 differences existing between the typical lowland lakes and 

 those close to the bluff. The former are for the greater part 

 open, while most of the latter are surrounded by a dense 

 growth of trees, largely composed of Tilia amencaTm^ 

 Acer dasycarpumj Acsculus glabra^ Gleditschia triacanthos^ 

 Morus ruhray Ulmus americanaj Ulmus julva, Betula nigra, 

 Quercus bicolor, Q. macrocarpaj Q. AhiJdeiibergii and Q. 

 ruhra^ Populus monilijera and species of Salix, In places 

 there is a dense undergrowth of Euonymus alropurpurcuSj 

 Samhiciis canadensis and Cephalanthus occidentalism accom- 

 panied by Vitis cinerca and V, cordijoliay Rosa setigera and 

 Ruhiis villosus. Here and there are open places where besides 

 the Hibiscus lasiocarpiis of the lowland lakes, H, militaris 

 also occurs, forming isolated clumps. Among the herbs 

 found near the bluff lake are Agrimonia Eupatoria and A. 

 parviflora. Lobelia cardinalis properly belongs here, as do 

 Aristoloclda tomentom and Asarum canadense, both from the 

 lower hillside. Species of Potamogeton appear to be more 

 frequent in the lowland lakes, but the bluff lakes harbor more 

 specinnms of Eleocharis. Nnpliar advena minus, not found in 

 the lowland lakes, where NympJiaea odorata occurs, is found 

 in the bluff lakes. Here Nelumbium luteum, though some- 

 times found, is not so marked a feature (plate 20), 



THE RAILROAD. 



The main difference between the railroad right of way in 

 IlUnois and that in the Missouri portion of the section studied 

 lies in the fact that while the latter is situated close to the 



* Joe. Cli 



