198 MISSOURI BOTANICAL GARDEN. 



once patent to the eye on account of the numerous trees and 

 shrubs which line its banks. The principal trees arc Tilia 

 amcricana, Acer dasycarpuviy A . ruhrum, A . saccharinum^ 

 Negundo aceraideSj Cercis canadensis^ Gleditschia triacanthos, 

 Gymnodadus canadensis, Fraxinus americanaj F. viridisj 

 Celtis occidentalism Morus rubra, Ulmus americanaj Platanus 

 occidentalism Carya amara, C. olivaejormis, Betula nigra, Car- 

 pinus caroliniana, Querciis macrocarpa^ Salix cordata X seri- 

 cea and Salix nigra. Smaller trees and shrubs occurring here 

 are Asimina triloba, Ptelea trifoliata, Rhamnus lanceolata, 

 Staphylea tri folia, Amelanchier canadensis, Prunus amcricana, 

 P. serotina and P. virginiana^ Pyrus coronaria, Hydrangea 

 arborescens, Cormis asperijolia, C, paniculata, Samhucus cana- 

 densis, Symphoricarpus vulgaris. Viburnum Lentago, Foresticra 

 acuminata, Corylus americana and Celtis mississippiensis. 

 Vines are numerous, especially Ampelopsis quinqiiej alia ^ Cissiis 

 Ampelopsis, Vitis cinerca, V. cordifolia, and V. riparia as 

 well as Rhus Toxicodendron. Menispermum canadense, Con- 

 volvulus Sepium and Ipomoea pandurata are frequently 

 encountered. Clematis virginiana is not rare. Near the 

 water Echinocystis lobata and Sicyos angulatus occur in 

 places. 



In spring there is developed an abundant rosette flora 

 chiefly composed of Ranunculaceae and Liliaceae. Anemo- 



1 



nella thalictr aides, Isopynim biternatum, Ranunculus ahortivus 

 and P, sejjtentrionalis, Thalictrum purpurascens, Podophyllum 

 peltatum, Sanguinana canadensis, Dicentra Cucullaria, Sani- 

 cula marylandica canadensis, Trillium recurvatum, T. sessile 

 and Uvularia perfoliala are the most common. Arisaema 

 Dracontium and A. triphyllum are everywhere. Among the 

 Carices, C, Davisii, C. granularis, C. laxiflora and C Shortiana 

 are the most frequent. Cyperus erylhrorhizos and Poa pra- 

 tensis are everywhere at this time. Of ferns, the principal 

 ones are Adiantum pedatum and Cystopteris fragilis. While 

 early summer does not make any great changes in the vege- 

 tation, there is a gradual change with the seasons so that in 

 late summer and early fall one finds that Compositae and 

 Labiatae have taken possession. 



