326 



The Ohio Naturalist. 



[Vol. VIII, No. 6, 



gonifolia, and Oenothera oakesiana are here more important vege- 

 tational elements than they are in the true Sand Plain. The 

 successional stages following such a blowout formation are not 

 clear; generally with the constant shifting of the sand the blowout 

 is filled up with sand before a succeeding stage can become of 

 importance. Perhaps, as in the case of the heath, the oak forest 

 may be able to take possession without the intervention of a 

 thicket stage. 



Fig. 14. Juniper-capped dunes north of the Lake Laborator)'. The 

 blowout has Panicum, Andropogon, Artemisia, Salix interior. At base of 

 dvme at extreme right is a small patch of Arctostaphylos uva-ursi' 



To the north of the Laboratory a short distance the dunes are 

 mostly capped by good sized Junipers and it is plainly to be seen 

 (Figs. 13 and 14) that with the death of these plants the dunes will 

 be quickly destroyed. This locality must in the not distant 

 past have been occupied by an Arctostaphylos- J uniperus Heath 

 Formation, but with some sort of a change in the environment 

 the conditions have become such that the deciduous dune and 

 blowout formations have advanced towards the north, the 

 Juniperus-capped dunes thus being remnants of a former 

 heath. Possibly the reproduction of Junipers imder the pro- 

 tection of vegetation other than the heath, as in Fig. 12 under 

 Quercus imbricaria, may be concerned prominently with such 

 conditions. 



