PUBLIC PARKS OF IOWA 81 



green trees in this region mention might be made of the white pine, 

 red cedar, dwarf juniper. The quaking aspen and large toothed aspen are 

 common on the hills. An abundance of the green ash (Eraxinus lance- 

 olata) the almond leaved willow (Salix amygdaloides), sand bar willow (S. 

 fluviatile) black willow (S. nigra), cordate willow (S. cordata) and prairie 

 willow (S. humilis) are common generally in low grounds, except the 

 last named species which occurs in little openings on the hills. Roses 

 (Rosa prantinicola and R. blanda) are plentiful in woods and prairies. 



