April, 1908.] 



The Vegetation of Cedar Point. 



325 



what more sheltered position. Among the secondary species are 

 a few not found in the formation as it appears on the dunes. One 

 plant of Juniperus nana appears here, this being probably the ex- 

 treme southern range of the species, so far reported for America, 

 excepting certain distinctly alpine stations. 



In the vicinity of the Lake Laboratory there is a blowout 

 vegetation of a distinctly different character from that of the 

 heath occupying the blowouts farther to the north. Apparently 

 due to the deciduous character of the dune vegetation in the 

 southern part of the Dune Section the blowouts are more pro- 

 nounced, and, in fact, the dunes are often completely destroyed 

 by the undermining of the sand by a deep adjacent blowout. 



Fig 13. Juniper-capped dune to the north of the Laboratory. The 

 blowout which includes some "fossil beach" has Panic tun virgatum,- P 

 scribnerianum, Andropogon, Salix interior, Lepidium virginicum. 



In manv cases the sand has been blown away so that the former 

 beach has been again exposed (fossil beach) and in one blowout 

 to the south of the Laboratory there has been either a wind exca- 

 vation below the normal Lake level or the water has risen into 

 the bottom of a deep blowout, and there has been initiated there 

 a small lagoon succession. 



The blowout vegetation near the Laboratory may probably 

 be best regarded as an extension of the Artemisia-Paniciim Sand 

 Plain Formation. The same facies are in evidence although the 

 relative importance of the secondary species is considerably dif- 

 ferent. Salix interior and its variet\- wheeleri, Euphorbia poly- 



