/ 



190 MISSOURI BOTANICAL GARDEN. 



4 



Eupatorium purpureum and E. serotinum. There occur 

 occasional specimens of Datura Stramonium and D. Tatula, 

 Solarium carolinense and S. nigrum. In places Chenopodium 

 ambrodoides and C. amhrosioides anthclminticum take com- 

 plete possession. Equisetum laevigafum is not frequent. 

 Aristida oligantha and Spordbolus vaginaeflorus appear in 



the latter part of the vear. 



THE ILLINOIS BOTTOM. 



The dry bottom. 



That portion of the Illinois bottom usually designated as 

 •'dry" bottom and possessing a sandy soil, supports a rich 

 and greatly diversified flora, in sharp contrast with the drier 

 and higher portions of the Mississippi bottom in St. Louis 

 county, where the soil is a heavy clay. 



The spring flora is rich in Ranunculaceae, such as Anemone 

 pennsylvanica, Myosurus minimus, Ranunculus ahortivus, 

 R. repens, R. septentrionalis, and in Cruciferac. Capsella 

 Bursa-pastoris, Dcntaria ladniata, Draba hrachycarpa and 

 D. caroliniana, Nasturtium sinuatum, Sisymbrium canescens 

 and S. officinale, Cerasiium arvense, C. arvense ohlongif olius , 

 and C. nutans are everywhere, as are rosettes of Geranium 

 carolinianum and Oxalis stricta. Among the Umbcllifcrae 

 Chaerophylhmi procumhens and Cryptotaenia canadensis are 



frequent at this time. Sonchus asper and S. oleraceus 

 are everywhere, as are Verbena stricta and V. urticaej olia , 

 Brunella vidgaris and the local species of Plantago. Carices 

 and other Cypcraccae arc numerous. The summer adds several 

 Crucifcrae as well as Leguminosae, such as Cassia Chamae- 

 crista, Crotalaria sagittalis, Desmodium canescens, D. ciliare, 

 D. cuspidatum, D. Dillenii, D. paniculatum and D. rigidum, 

 Glycyrrhiza lepidota, Lespedeza capitata, L. procumhens, L. 

 violacea, Mdilotus alba, M. officinalis, Strophostyles angulosa, 

 S. pauciflora, Trifolium hybridum, T. pratense and T. repens, 

 together with a large number of Compositae. These include 

 Ambrosia artemisiaefolia, A. bidentata and A. triflda, Aster 

 patens, Bidens bipinnata, Erigeron canadensis, E. philadelphicus 

 and E. strigosus, Helianthus annuus, 11. tuberosus, Solidago 



canadensis, S. serotina and several others. The Compositae 



most 



