HERBACEOUS FLORA OF CAHABA VALLEY AND WARRIOR BASIN. 93 



-flora is known in the State only from the same locality, though it is 

 found also in western Florida on the banks of the Apalachicola near 

 the Georgia State line. A notable instance of disjoined range is that 

 of Solidago curtisii, which also occurs near Tuscaloosa. It is chiefly 

 a plant of the high mountains of Virginia, North Carolina, and Ten- 

 nessee. Eupatorium incarnatum, which is found on the banks of 

 North River (Tuscaloosa County) ranges from northwestern Louisiana 

 and eastern Texas to east Tennessee and South Carolina. The fol- 

 lowing species, recorded in the order of their times of flowering, 

 descend from the Tennessee Valley and the mountain region and on 

 these hills find their southern limit: 



Sanguinaria canadensis. Polemonium reptans. 



Anemone quinquefolia. Phacelia purshii 



Syndesmon thalidroides. Heuchera americana. 



Isopyrum biternatum. Heuchera mllosa. 



Uvularia grandiflora. Porteranthus stipulacea. 



Uvularia sessilifolia. Sabbatia boyJdnii. 



Dentaria laciniata multifida. Verbesina helianthoides. 



Anemone caroliniana. Verbesina alternifolia. 



Anemone virginica. Campanula divaricata. 



Saxifraga virginiensis. Mimulus alalus. 



Viola sagittata. Solidago nemoralis. 



Viola pubescens. Solidago amplexicaulis. 



Actaea alba. Solidago flexicaulis. 



Bicuculla cucullaria. Aster shortii. 



Washingtonia longistylis. Aster camptosorus. 

 Obolaria virginica. 



In their extreme southern continuation the Alleghanian spurs pene- 

 trate the Central Pine belt in Bibb County, there reduced to low, short 

 ridges. Their outcrops, consisting of the oldest Silurian sandstones 

 and cherts and Subcarboniferous limestones, give rise on this narrow 

 area to a diversity of soil conditions, and hence their plant associa- 

 tions, generally of xerophile character, present a remarkable variety. 

 Among the arboreal vegetation Acer floridanum is found. This 

 maple, below medium size, occurs also in middle Florida and on the 

 Tertiary hills in the upper division of the coast pine belt. It is here 

 for the first time encountered by one coming from the northern part 

 of the State. 



After a long series of years of doubt concerning the existence of 

 Quercus brevttoba in Alabama, it was found in this region by the 

 writer on the limestone hills lining the Little Cahaba River in 1882, 

 more than forty years after it was first credited to the State by 

 Buckley, who also discovered this tree subsequently in southern 

 Texas. Under the shade of an open grove formed by this stately 

 oak, in a rocky valley near Pratts Ferry, Croton aldbamensis was dis- 

 covered by Dr. E. A. Smith, forming dense thickets several acres in 



