292 



BOTANICAL GAZETTE 



[OCTOBER 



lighthouse dune coming down, a bare, loose slope, to the beach. 

 South of this is a hollow, formed by active dunes, and in which 

 lies a swamp. Just in front of this swamp are the remains of the 

 only low Ammophila dunes in this part of the region. 



2. Dunes. — {a) Outer series. — South of Rehoboth this outer 

 series is practically fixed. The sea face is exposed to storms 

 from the sea, and is sharply eroded. North of Rehoboth this 

 series is more active, being formed of loose sand partially held 

 by Ammophila, the activity increasing until the lighthouse dune 





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Fig. 3. — Southwest from lighthouse ; lighthouse dune in foreground ; swampy 

 hollow at center; active dunes ("pine graveyards"), beyond which is a pine forest. 



forms the climax. In this region they have a rounded form due 

 to their activity. For most of the distance from Rehoboth to 

 the Cape this series varies in height from 6-10 feet, getting 

 higher to the north, where it culminates in the 80-90 feet light- 

 house dune. In places it slopes from its crest into a heath, 

 although it is usually followed by a dune complex or swampy 

 meadow. Just south of the lighthouse dune lies the previously 

 mentioned semicircle of active dunes enclosing a swamp. Other 

 dunes stretch in a S.E.-N.W. direction, showing a northeast 

 wind action. On the windward slopes of these dunes are several 



?V the remains of the forest over 



•* pine graveyards '' ? [jig^ j^ ^ 



which the dunes are now passing, A little further south, at the 



7 COWLES, /OC, Cit. 2q8. 



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