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IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



and oak. P^ollowing these ravines a short distance from their 

 mouths are lines of Crataegus mollis, Pyriis ioivensis, Populiis 

 deltaides and Ulmm fulva. On the brow of one of these hills are 

 thickets of Rhus glabra and young trees of Ulmiis americana, 



Fig. 156. — Anemone patens var. Wolfgangiana. Tlie first and most prom- 

 inent plant of tlTe spring aspect. 



Crataegus mollis, P>;rus iowoisis, Vitis vulpina and Celastrus 

 scandens are seen. These are typical pioneer wood trees of this 

 region. 



The moraiiial .scallops of hilLs swing around the tuni of the 

 river and are wood covered as they run parallel with the river 

 farther on. Next in the series to the Ixlius Vlmus ravine is an- 



