A NEW QUILLWORT. 
RAYNAL DODGE. 
( WITH PLATES IV AND V) 
In the early summer of 1895, Mr. Alvah A. Eaton of Sea- 
brook, N. H., noticed at East Kingston, in the same state, a 
plant which proves to be a new species of Isoetes. This plant 
was found on Powwow river “flats,” which comprise a nearly level, 
somewhat irregular tract of land, about a half mile wide and a 
mile and a half long, through the middle of which during 
summer the Powwow river flows, but for six or eight months of 
the year the area is for the most part submerged. The plants 
are scattered all over this locality, being however not at all 
gregarious; some having been found in the latter part of July 
growing up to high water mark, accompanied by Agrostis vulgaris, 
Poa compressa, Trifolium repens, and various asters; whilst others 
were thriving in the river, immersed in six inches or a foot of 
water, and accompanied by such aquatics as Scirpus subterminalis, 
the plants in the latter instance floating their enormously long 
leaves on the surface. The soil in this locality is a deep 
alluvium underlaid with sand, and upon its surface, besides the 
Graminez and Junci which usually occupy such situations, 
several species of Isoetes grow, for the most part gregariously, 
among which I recognize /. riparia, I. Engelmanni, I. echinospora 
Boottii, and I. echinospora muricata. These are accompanied by 
the peculiar species which I propose now to discuss. 
This signi twirac coriaet which I name 7. or in honor of = 
Cts 
‘bat the plants are from a foot to ten feet apart, and. are thus 
sed throughout the station. It is noticed at a higher level 
than any of the forms with which it is associated, ane if it does 
? : not ona occur at a lower — it at least has t 
