i9o8] TRANSFAU— PLANT SOCIETIES AND EVAPORATION 



225 



gradually 



This area is densely 



wooded and the herbaceous vegetation is very characteristic for the 

 habitat. The trees are Castanea dentata^ Fraxinus americafia, Priiniis 

 serotina^ Betula le?ita, Acer rubnim, Qiiercus prinuSj and Tilia amcri- 

 cana. The shrub layer is made up of Benzoin benzoin, Cornus 



florida 



Ijolinm 



and 5. herhacea. The dominant herbs are Washingtonia longistylis^ 

 Arisaenia IriphyUum^ Trillium cernimm, Smilacina racemosa, Actaea 



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V 



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'^"-"^^"^ ■ '^ ^ jiianfitii)irr'Tiiir-^-^---Tinr ' ' 



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Fig, 7. — ^Northern edge of swamp forest in which Station 8 was located. 



(^Iba, Impatiens biflora, Dryopteris acroslichoides, and Serkocarpus 

 dsteroides. 



Jaly 14-23 

 (9 days) 



Amt. evaporation^ Station 7 18.5*^*^ 



Amt. evaporation, standard 141 9 



Comparative evaporation 13 -^ 



Here we see a further marked reduction in the evaporation rate, 

 when compared \\ith the wooded hilltop and slopes. The presence 

 of Benzoin, Trillium, and Arisaema, however, is in keeping with it. 



Station 5.— Swamp forest at the head of St. Jotin's pond 

 from the Carnegie garden {fig. 7); altitude 5°^. The soil is gravel 

 and the water table is ver\' near the surface. The forest cover is com- 



^M 



