192 MISSOURI BOTANICAL GARDEN. 



f Salix amygdaloides, S 

 ngifolia and 



submerijfcd. T\\ 



I 



to be 

 atcd 



re 



barrier 



pointed out by Sargent, t many of the species not being found 



in Missouri. 



illustrated by 



aquatica, specimens of which are not infrequent in the Ameri- 

 can Bottom opposite St. Louis, but which is not found in 

 St. Louis county, though it appears on the Missouri side 

 opposite Alton, which coincides with the change in physio- 

 graphy, since here the Illinois bluffs overhang the river while 

 on the Missouri side there arc vast bottom lands. 



The wooded bottom. 



r 



The wooded bottom is mainly covered by Carya amara 

 and C. olivaejormis, Quercus hicolor, Q, macrocarpa, Q.palus- 

 tris, Glcditscliia triacanOios, Gymnodadus canadensis, Populus 

 monilijera, Celtis mississippiensis and Celtis occidentolis, 

 though Betula nigra and Uhnus amencana are not infrequent. 

 The trees are placed close together, and except at the edges, 

 few other species occur. Grapevines arc most numerous, 

 including Ampelopsis quinquef olia , Vitis dncrca, V. cordi- 

 jolia, and V. riparia. The spring flora is limited to Ranuncu- 

 lus abortivus, Capsella Bursa-pastoris, Claylonia vlrginica, 

 Arisaema Dracontium and A. triphyllum, Sagittaria varia- 

 hilis, Alisvia Plantago, Carex gramdaris and C. laxiflora. 

 During the early part of the year rosettes of Lactuca hido- 

 viciana, Lobelia cardinalis and L. syphilitica develop. Lo- 

 hclia cardinalis is the most striking plant in the fall of the 

 year, producing immense spikes 6-8 feet in height, bearing 

 brilliant red flowers. At this time Cassia marylandica is con- 

 spicuous. There is an undergrowth of brambles. 



* Sargent, C. S. Manual of the Trees of North America. 1905. 



t Sargent, C. S. Crataegus in Missouri. Rept. Mo. Bot. GarJ. 19 : 35. 



1908. 



