DuRING THE SUMMER OF IQOI 323 
terminal umbel, generally inhabiting muddy swamps of creeks and 
rivers. It too is often proliferous late in the season, but the tufts 
of leaves spring from the nodes oftener than from the inflorescence. 
(This character is well shown in my no. 1142, collected in the 
swamp of Muckalee Creek above Americus, July 30.) In all the 
specimens of S. divaricatus examined I have observed no deviation 
from a strictly terminal umbel, while in the species under con- 
sideration every specimen I saw had at least one lateral one. 
The specimens of Scirpus fontinalis were collected in the shal- 
low margin of a shaded pool of clear cool water issuing from a 
spring within the corporate limits of Leslie, Sumter County, on the 
afternoon of July 6 (no. 1012). It was accompanied by Cyperus 
strigosus, Scirpus Eriophorum, Rhynchospora miliacea, Juncus se- 
taceus, Polygonum setaceum, Samolus floribundus, and other semi- 
aquatic plants. The temperature of the water was taken the same 
afternoon and the next morning, in different parts of the pool and 
at various depths, and was found to be in every case 68° Fahren- 
heit. It probably does not vary much from this point throughout 
the year. A fragment of fossiliferous rock from the hillside just 
above the spring was sent to the U.S. Geological Survey and 
identified as being probably of the Zeuglodon horizon (uppermost 
Eocene). The chemical composition of this rock has not been de- 
termined, but the water issuing from it is reputed to be limestone 
water. 
ELEOCHARIS RopsBinstt Oakes 
On July 13 I found in the northern part of Lee County a pine- 
barren pond perhaps ten acres in extent and two feet deep in the 
middle, almost filled with this species (no. 1068), growing so 
luxuriantly as to conceal the water. This seems to be the only 
station reported for it between Delaware and Florida. The only 
other plants seen in the deeper parts of the pond were Homalo- 
cenchrus hexandrus and afew small Cephalanthus bushes. Around 
the margins of the pond were observed among other things Sporo- 
bolus compressus, Rhynchospora fusca, R. Tracyt, Scleria gracilis, 
Polygala ramosa, Stillingia aquatica, Rhexia aristosa and Boltonia 
diffusa, some of which have an equally remarkable distribution. 
