160 Harper: Explorations in Georgia 1903 



to be, for there is no evidence that Croom was ever in South 

 Florida, It is not unh'kely that Croom got his specimens of it on 

 the sand-hills of Brier Creek, on the road from Augusta to Louis- 

 ville, where he is known to have collected several other interest- 

 ing plants. 



The original specimen is too fragmentary to be of much value 



for purposes of comparison, but w^hat there is of it seems to be 

 identical with my no. igSj. It has longer spikes than P, brachys- 

 tachya, but it is not necessarily specifically distinct (With this 

 possible exception there is at present no valid species bearing the 

 specific name Crooniii.) 



Talinum teretifolium Pursh 



Grows on dry outcrops of Altamaha Grit in the pine-barrens 

 of Tattnall {no. i8^g, June 26) and Dooly counties, where it 

 seems as much at home as on granite rocks in Middle Georgia. 

 Not previously known from the coastal plain. (It is reported 

 from Florida in Dr. SmalTs Flora, but I can find no specimens to 

 confirm this.) 



Paronychia riparia Chapm. 



This species, for a long time known only from the banks of the 

 Flint River in the lime-sink region, now turns out to be not un- 

 common in Southeast Georgia. In June I saw it more than once 

 in Tattnall County, on July 3 I collected it at the base of the 

 sand-hills of Gum Swamp Creek in Montgomery County, where 

 it was abundant {no. iS6g), and in September I saw It on both 

 sides of the Ocmulgee River near Lumber Q!ity, and on the sand- 

 hills of the Altamaha in Liberty and Mcintosh counties. 



GiBBESiA Rugelii (Shuttl.) Small 



In the Altamaha Gnt region near the base of the sand-hills of 

 the Little Ocmulgee River In Montgomery County opposite Lum- 

 ber City, September 10 {no, iggo). Previously known only from 

 Florida and the lime-sink regions of Decatur and Lowndes coun- 



ties. 



Ceratophyllum demersum L. 



On August ij I found some magnificent but apparently sterile 

 specimens of this {jio. igj2) growing in a clear cool stream four 



