PLANT SUCCESSION ON SAND 



221 



extensive root systems which are composed of slender, much 

 branched roots and they grow better in pure sand than where 

 organic matter is present. Along with these are often found the 



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h^:i 



Si-V 



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■ H^-i"-'jiiM.u 





Fig. 98.—AtnmophUa arenaria, a sand pioneer, being replaced by Arcto- 

 stophylos uva-ursi in the foreground and Jimiperus virginiana in the background. 

 (Photograph by A. G. Eldredge.) 



Fig. 99.— Wormwood (Artemisia stelleriana) , a sand pioneer. (Photograph by 



A. G. Eldredge.) 



sand-reed grass (Calaviovilfa longifolia), the sea-rocket {Cakile 

 edenhda), the puccoon (Lithospermitm canescens), sometimes the 

 false heather ( Ihidsonia tomentosa) , etc. 



