THE BARBERRY IN IOWA 



235 



between the Missouri and the Mississippi basin and the soil is Mis- 

 souri loess. 



The specimens at Monmouth were growing in Maquoketa lime- 

 stone rock, associated with bur oak (Qucrcns macrocarpa) Solidago 

 V cm oralis, S. rig'ida and Aster a aureus. 



The specimens at Clear Lake occurred on drift soils associated 

 with Qucrcns macrocarpa, Ostrya virginiana, Prunus scrotina, P. 

 I'irginiaiia, Tilia amcricaiia, Uhnus fulva and Ccltis occidcnfalis. 



The specimens on the shores of Iowa Lake also are in drift soil. 

 Some of the plants noted by me as being found in the woods were 

 as follows: Quercus macrocarpa, Ulmus fidva, U. americana, Tilia 

 amcricana, Ccltis occidcn talis, Prunus virginiana, P. scrotina, Rhus 

 typhina. 



hil'//f/ 





s V> 



Pig. 82. — Young Barberry shoots coming from roots of old plant removed two 

 feet from the center of the area B. Drawn by C. M. King. 



It is difficult to say from what I have observed that calcareous 

 rocky soil is particularly favorable to the establishment of the bar- 

 berry. The habit of the plant has been changed because of its long 

 period of migration from Asia. It has established itself wherever 

 birds have scattered its seed. 



Mr. J. J. Wilson tells me that there are also some escaped bar- 

 berries near Colo. These escaped from an old nursery. 



