PUBLIC PARKS OF IOWA 57 



Bird foot violet (Viola pedata} (W) 



Flax (Linum sulcatum) (W) 



New Jersey tea (Ceanothus ovatus) (W) 



Hosackia (Hosaskia Purshiana) (W) 



Prairie clover (Petalo sternum multiflorus) (W) 



Needle grass (Stipa spartea) (W) 



Lead plant (Amorpha canescens) (W) 



Wind flower (Anemone cylindrica) (W & E) 



Purple sorrel (Oxalis violacea) (E) 



Sumach (Rhus glabra) (E) 



Milk vetch (Astragalus carycocarpos) (W) 



Wild licorice (Glycyrrhiza lepidota) (W) 



Five finger (Potentilla arguta} (E & W) 



Houstonia (Houstonia angustifolia) (E) 



Common sunflower (Helianthus annuus) (W) 



Yarrow (Achillea millefolium) 



Morning glory (Convolvulus sepium), hairy form (W) 



Sheep sorrel (Rumex acetosella) (Cos) 



Spurge (Euphorbia dictyosperma) 



Spurge (Euphorbia Geyeri) (W) 



Blue grass (Poa pratensis) (Cos) 



Tickle grass (Panicum capillare) (E & W) 



Side oats (Souteloua racemosa) (E & W) 



Switch grass (Panicum virgatum) (W) 



Dropseed grass (Sporobolus cryptandrous) (E & W) 



Missouri golden rod (Solidago Missouriensis) 



Yarrow (Achillea millefolium) 



Catchfly (Silena antirrhina) 



Wild four o'clock (Oxybaphus angustifolius) 



Small fox glove (Gerardia aspera) 



Prairie sunflower (Helianthus Maximiliani) 



Aster (Aster multiflorus) 



Sunflower (Helianthus rigidus) 



Blue sage (Salvia lanceolata) 



Narrow fox glove (Gerardia tenuiflora) 



These are some of the common types over the entire loess mounds. 

 The western blazing star (Liatris punctata) with its deep straight roots 

 has enabled the plant to adapt itself to the droughty conditions which 

 frequently prevail in the region. The Spanish bayonet (Yucca angusti- 

 folia) common in sections of Nebraska, the Dakotas and Kansas is a 

 rare plant in this region, although becoming more common northward 

 in the vicinity of Sioux City. It is confined to the steep banks, well up 

 near the summits of the mounds. 



The mesophytic flora is gradually encroaching upon the xerophytic, 

 and as important forerunners for the mesophytic vegetation several of the 

 shrubs like Snowberry (Symphoricarpos) play a conspicuous part. East- 

 ward in northeastern and central Iowa the hazelnut (Corylus Americana) 

 is the chief factor in changing the character of the vegetation. 



The amount of precipitation collected for a series of years indicates 

 that this region is much drier than in the drainage east of the Mis- 

 souri river basin. 



