244 



as at present, but it is inconceivable that the CJieilanthes ever 

 did so. 



In May of this year I received from Mr. S. W. McCallie, as- 

 sistant state geologist of Georgia, some specimens of DiaviorpJia 

 pusilla collected on a flat outcrop of this rock in the southeastern 

 part of Washington County, and on July 20th I sought out and 

 found the locality, with most gratifying results. In open pine- 

 barrens between the stations of Peacocks and Harrison I found 

 one flat rock covering about an acre, as well as several smaller 

 ones, all of which strikingly resembled some of the flat granite 

 rocks around Athens, Stone Mountain, and other places in 

 Middle Georgia.* No projecting ledges or cliffs were seen at 

 these places, and the rock stratum is probably pretty thin. 



On these flat rocks were observed Senccio tomcntosus, Marshal- 

 lia rainosa, Aster sguarrosus, CJioudroplwra virgata, Iljsanthes 

 rcfracta, Trachelospermuvt difformc, Crotonopsis linearis, Arenaria 

 brevifolia, Talimim terctifoliiun, Alliuvi Cuthbertii, Rynchospora 

 cyniosa and Selaginclla acanthofiota, each of which was already 

 known from one or more localities in the Altamaha Grit region, 

 but had not been seen in Washington County before, f I found 

 also at the same places Sericocarp?is /inifolius and Acerah's flori- 

 dana, new to the Altamaha Grit region but not to the coastal 

 plain, Kneiffia sp. and Diamorpha pusilla, new to the coastal plain, 

 and a species of Ciiscuta, probably new to science. Unlike all 

 other known species of Cuscuta, this one grew exclusively on one 

 of the most characteristic plants of such situations, Chondrophora 

 virgata, which of course (as it has been seen by so few botanists) 

 has never had any such parasite reported from it before. The 

 Cuscuta was quite plentiful, but I could not find a trace of it on 

 any other host. 



A little later in the day I saw a similar rock outcrop just out- 



* For an excellent illustration of such a fiat granite area see Bull. Geol. Surv. Ga. 

 9 A : pi. 17. f. I. 1902. 



t For a summary of the previously known distribution of these species within the 

 region, see the catalogue of species (pages 132-322) in my phytogeographical sketch. 

 Notes on the occurrence of some of them in the mountains of Alabama were published 

 in ToRREYA for June, 1906, and there is a note on Trackelosper?>ium in Bull. Torrey 

 Club 33 : 535. 1906. 



