1902] THE ECOLOGY OF THE DELAWARE COAST 301 



said here. Ammophila characterizes the crest, associating with 

 heath forms as the plain slopes toward the west. Just north of 

 Rehoboth is a good example of this condition. Here scant 

 Ammophila growth is accompanied by Lespedeza proctimbens, 

 Sarothra ge^itianoides {Hypericum ?indicaule)y Lespedeza capitata^ 

 Helianthemum canadensCy and Pinus rigida just over the crest; 

 while four clumps of Panicum virgatum stand out on the wind- 

 ward side among the scant vegetation creeping up from the 

 Hudsonia complex. 



3. Heath. — Although small portions of heath occur in 

 many places on the lee side of the first series of dunes, the heath 

 proper must be considered as starting from the second series 

 and extending back to the forest. Its chief characteristic appears 

 to be its large number of species of varied distribution, with very 

 few that stand out as character forms, even the most common 

 plants not being characteristic of all parts of the heath. Just 

 south of Rehoboth occurs the most typical piece of this forma- 

 tion {fig. g) , being less interrupted by roads, cultivated fields, 

 etc., than elsewhere, consequently most of the forms mentioned 

 were collected in this region. It is a wilderness of Baptisia 

 tinctoria and blackberries {Rubus villosus, R. cuneifolitis, R. cana- 

 de?isis^ , with occasionally almost meadow-like growths of 

 Ammophila, In clumps or singly rise cedars {Junipehis vir~ 

 giniand), persimmons {Diospyros virgmiand)^ pines {^Pimis virgin- 

 tana, P. rigidd), oaks {^Quercus digitatd) ^ Primus maritima, P. 

 pennsylvanica, Myrica cerifera, Rhus copallina^ and Helianthemum 

 canadense^ with an occasional Sassafras sassafras (5". officinale). 

 A bush or two of Rosa humilis appeared at two points, and holly 

 {Ilex opacd) at only one. Among the herbaceous dicotyledons 

 from rare to frequent were observed Solidago juncea, S. canade?isis, 

 Eupatorium alburn,^ E, hyssopifolium, Erigeron ramosus, Leptilon 

 canadense. Aster ericoides, Gnaphalium obtiisifoli^im [G, polyceph- 

 alwn) , Achillea Millefolium, La.ctuca canadensis, Hieracium Gronovii, 

 Ascyrum hypericoides, Sarothra gentianoides, Asclepias tuberosa, 

 Linaria canadensis, Trichostema dichotomum, Meibomia arenicola 

 {Desmodium lineatum) , M. obtusa. (Z?. ciliare), Rumex sp., and in 



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