VEGETATION OF KOCK HOUSES. 75 



The following are frequent in the openings of woods and on their 

 borders: 



Vagnera racemom. Tiarella cordifoUa. 



Ui'ularia pubernhi. Hypericum virgatum. 



Uvularia sessillfolia. Scutellaria incana. 



Iris eri^tata. Phlox divaricata.^ 



Syndesmon thalicli-oidi's. Mertensia virginica. 



Anemone quinqncfolin. Vincetoxicum idmUum. 



Anemone virginica. Gentianamllosa.^ 



Jianuncidus recnrraiiin. Galium circaezans. 



Cimidfuga racoiioaa. Housionia caendea. 



Trautvetteria carolivenris. Deringa canadenrii<. 



Viola hastata. Podophyllutn peHaiwn . ' 



Viola midticaulis. Sanguinariu canadentiix. 

 Viola pubescent. 



On the higher shad}" banks of water courses are found: 



Porteranthus {Gillenia) stipulaceus. Slachys eordata. 



Porteranfhus trifoHatUR. Zanthoririza apiifolia.^ 



In the more or less dense forest, covering hill and dale, are to be 

 found: 



Orchis spedahilis. Aralia racemosa. 



Cypripedium parrifloruiii .^ Sanicula marilandica (rare). 



Arisaema quinatum. Phryma leptostachya. 



Circaea lutetiaria. Frasera carolinensis.^ 



Hydrastis canadensix^ (scarce). Cynoglossum virginicuni. 



Bicueulla eucullaria. Obolaria virginica. 



Dentaria diphylla. Solidago flexicaulis. 



Cubelium concolor. Solidago vaseyi. 

 Panax quinquefoliinn.^ 



The Soli(Ja<j<> vasey! has been collected near Holmes Gap (1,500 

 feet), and is know^n from a few localities on the highest ranges of the 

 Carolinas and Georgia, 



On the restricted flat semiswampy places, not infrequently met with 

 on the Warrior table-land, open or slightly under cover, the following 

 are most frequently seen: 



Cyperus pseudo-regeins.^ Phlox macidata. 



Carex lupulina.^ Lysimacliia quadrifolia. 



Car ex lurida . ^ Genliana elliottii. ^ 



Habenaria ciliaris.^ Bidens involucrata. 



Xyrisflextwsa.^ Coreopsis grandiflora. 



RJie.na virginica.^ Doellingeria injirma. 

 Ludwigia alternifolia. ^ 



Mesopldle 2)lttnt associations of rock houses. — On the perpendicular 

 walls at the head of the deep narrow gorges are found shelves of hard, 

 resisting sandstone w ith the softer strata beneath them worn away by 

 the action of the percolating surface water. The wide and deep exca- 



^ Occurs also in the Louisianian area. 



