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IOWA ACADEMY OF SCIENCE Vol. XXV, 191S 



ture. Anenio-ne patens var. Wolfgangiana lias grown abun- 

 flantly for years on one of them while on the other two hills in a 

 correspondmg location one thriving plant is present on one 

 hillside and six or seven plants on the other hill, but the plants 

 do not increase in number. 



REVERSION. 

 Adjacent to the Anemone patens hill are two strips of prairie, 

 one of which has been uncultivated for twenty-one years and 

 the other uncultivated for thirty-six years. The following lisits 

 show the constituent plants of these associations. 



Fig. 149. — Alluvial Basin looking northeast from Heuchera Hill. Braun- 

 erla purpurea. 



UNCULTIVATED PRAIRIE. 



The species found in this area are : 

 Andropogon furcatus, Andropogon scoparius, Bauieloua cum- 

 pendula, Bouteloua hirsuta, Elymus rohustus, Koeleria cris- 

 tata, Sorgastrum nutans, Stipa spartea, Coniandra umheUata, 

 Anemone patens var. Wolfgangiana, Rosa pratincola, Amorpha 

 canescens, Petalostemon candidum, Petalostemnm pur- 

 pureum, Litliospermum canescens, Lithospermwm angustifol- 

 ium, Artemisia ludoviciana, Aster aznreus, Aster sericeus, 

 Cirsiimi lanceolaium, Coreopsis palmata, Ueliopsis scahra, 8il- 



