18 HARPER: EXPLORATIONS IN THE COASTAL PLAIN 
plant is inversely analogous to some species of /soetes (/. melano- 
spora and J, Orcuttit, for instance), which grow in shallow depres- 
sions on rocks and vegetate only in wet seasons. 
Fimbristylis perpusilla is one of the smallest and simplest species 
of the genus, but it is too different from the other species occurring 
in the vicinity to be regarded as a depauperate form of any of them 
and besides the specimens were perfectly healthy and vigorous, 
F, autumnalis sometimes finds its way into pine-barren ponds as. 
Fic. 4. Type-locality of /inebristylis perpusilla, near leslie, Sumter County. 
October 9. 
they dry up in summer or fall, but in so doing it changes none of 
its characters. A depauperate form of /. Frankii (also associated 
with a Riccia) has been found by Mr. A. A. Eaton on muddy 
shores of a pond in Kingston and East Kingston, N. H., but it is 
quite different from my plant. 
By its floral characters /. perpusilla seems nearest related to 
F. Vahli, but in that species (which is not known in Georgia) the 
culms are densely tufted and erect or nearly so, and the spikelets 
