65 



and occupying' so much space that their removal would seriously 

 change the nature and appearance of the consocies. A further study 

 shows that three species are so reg'ularly present and so frequently 

 associated with each other that they may be regarded as the most 

 typical g'rasses of the consocies. They are Leptoloma cognatnin, 

 Koelcria cristata, and Andropogon scoparius. The remaining nine 

 grasses are always secondary species and never occupy a considerable 

 portion of the ground space. Their huge bunches, as of Sorghastruni 

 nutans, or tall culms, as of Calanwz'ilfa longifoUa, may nevertheless 

 make them veiy conspicuous in some places. A few other grasses, 

 not bunch-formers, are also mentioned under the proper head. 



There is a great variety of perennials, interstitials, and a few 

 mats, of wliich the following were listed. 



Perennials : 



Bqnisetiun hycnialc, var. infer- 

 in ediiini 



Tradcscantia reflexa 



SisyrincJiiuni sp. 



Anemone cylindrica 



Baptisia hracteata 



Aniorpha canescens 



Petalosfeinnni pnrpurenin 



Petalosteniuni candiduni 



Tephrosia zirginiana 



Lespedena capitata 



Polygala polygaina 



Bnphorhia coroUata 



Rhus eanadensis, var. 

 illinoensis 



Ceanothus aniericanus 



CeanofJius ovatus 



Callirhoe triangulata 



Helianfhcuiinii umjus 



Viola pedafa 



Asclepias aniplexicaulis 



Acerates viridiflora 



Aeerafes viridiflora, var. 

 lanceolata 



B rewe ria Pick e ringii 



Phi or bifida 



Lithospernnim Gnielini 



J^erbena stricfa 

 Physostegia denticulata 

 Physalis virginiana 

 Physalis heterophylla 

 Penfsteinon grandiflorus 

 Pcntstenwn hirsutus 

 Synthyris Bui Hi 

 Kuhnia eupatorioides, var. 



corynibulosa 

 Liatris cylindracea 

 Liatris scariosa 

 Chrysopsis villosa 

 Solidago speciosa, var. 



angustata 

 Solidago nenwralis 

 Solidago ni issouriensis 

 Solidago rigida 

 Aster sericens 

 Aster nndtiflorus 

 Aster linariifolius 

 Aster sp. 

 Brauncria pallida 

 Helianthus scaberrinuis 

 Helianthus occidentalis 

 Coreopsis pahnata 

 Achillea Millefoliuui 

 Artcuiisia caudata 



