THE PEAIEIES 1S5 



ance of the species in old-time abundance in the limited areas of 

 undisturbed prairie chiefly along railways. 



The most common species of this group of invaders are the 

 following : 



Cicuta maculata L. 



Galium tinctoriuin L. 



Gerardia tenuif olia Vahl. 



Habenaria blepliariglottis (Willd.) Torr. 



Lilium canadense L. 



LytlLTum alatum Pursh. 



Potentilla paradoxa Xutt. (usually from sandy areas). 



Prenanthes racemosa Mickx. 



Salts longlfolia Muhl. 



Spiraea saUcifoUa L. 



Spirantlies cemua i L.^ EicB. 



Stachys palustris L. 



Several sedges also appear in similar situations, the most com- 

 mon perhaps being the following : 



Cares Sartwellii Dew. 



Cares scoparia Sohk. 



Cares tetanica var. Meadii (Dew.) Bail. 



With these species Anemone canadensis and Thalicfrum dasy- 

 carpum. which are included in the table, are also frequently as- 

 sociated. 



3. From the western plains. The more xerophytic sections 

 of the western part of the state, chiefly the loess ridges border- 

 ing the Missouri valley on the east and the Kansan ridges 

 bordering the Big Sioux in Iowa, yield a noticeable scattering 

 of species belonging more properly to the dry western plains. 



In addition to the more common species of this group, which 

 are included in the table, such as Acerates viridifJora var. lin- 

 earis, Aplopappus spinulosus. Artemisia fngida. Astragalus 

 lotiflorus. Astragalus plattensis. Euphorbia marginata. Lygodes- 

 mia juncea and Oxytropis Lamherti. the following species oc- 

 curring locally in the western part of the state should be classed 

 here: 



Buchloe dactyloides (Xutt.T Engelm. Once probably quite common. 



Cares stenophylla T^ahlenb. 



Cerastiiun brachypodum ("Engelm.) Bob. 



Comandra Bichardsoniana Fern. 



TOL. VI — 1. 14 



