126 



approximately natural conditions still existed. The bottom of 

 the valley is about 1000 feet above sea-level, and the bluff at 

 Marble Hill rises about 500 feet higher, but the marble seems 

 to be all within about 100 feet (vertically) of the valley bottom. 

 The following plant list is made up of plants seen on Octo- 

 ber 17th on the lower part of the bluff, which faces northward 

 and is pretty well covered with rich residual soil and humus, 

 except where the marble ledges protrude. The line of contact 

 between the marble and the non-calcareous rock above it 

 was rather obscure, but I determined it approximately by 

 means of the vegetation. The vegetation had been damaged 

 a little by human agencies, but weeds are excluded from the 

 following list. In the short time available it was not possible 

 to examine a large enough area to determine the relative abund- 

 ance of the species very well, and the following sequence is 

 only tentative. Trees, shrubs, vines, etc., are separated, as 

 has been my custom for many years. 



TREES SHRUBS 



•^^^^'^ ^P- Benzoin aestivale 



Liriodendron Tulipifera Asimina triloba 



Fraxtnus americana Philadelphus sp. 



Quercus boreahs maxima? Staphylea trifolia 



Ulmusfulva Hydrangea arborescens 



Quercus Mzchauxtt? ^^^^^ Ugustrinal 



Juglans mgra ^^^^^^^ ^^ 



SMALL TREES HERBS 



Morus rubra Heuchera macrorhiza 



Cercis canadensis Solidago flexicaulis 



Halesia Carolina Adiantum pedatum 



Aster cor dif alius 

 Eupatorium ageratoides 

 Rhus radicans Adicea pumila 



Collinsonia anisata 

 A quilegia canadensis 

 Polystichum acrostichoides 



None of the species above listed are confined to calcareous 

 rocks or soils, but several of them are more abundant in such 

 soils than in acid soils. Some are very characteristic of the 

 shale bluffs along the Warrior River in Tuscaloosa County, 

 Alabama, described by the writer a few years ago.^ 



2 Jour. EHsha Mitchell Sci. Soc. 37: 153-160, pi. 28. April, 1922. 



