36 LEAFLETS. 
Riparian state. Assurgent stem less than a foot high from a 
prostrate basal portion rooting at the nodes: leaves smaller and 
relatively narrower, truly lanceolate, the leaf-surface quite stri- 
gose and veins also strigose rather than muriculate: spikes 
slender ; bracts as in the normal state. 
Specimens of the terrestrial form described above have been 
somewhat copiously distributed from Pennsylvania, the habitat 
of Muhlenburg’s P. coccineum with which this plant must doubt- 
less be identified. In the U. S. Herb. exists a very good sheet 
obtained at Lily Lake, Luzerne Co., in 1889, by Mr. Small; also 
two by Mr. Heller, both from Lancaster Co., in 1889 and 1891. 
Plants exactly like these are in hand from the District of Colum- 
bia, by L. F. Ward, in 1877, and from the banks of the Ohio in 
Wood County, West Virginia, 1897, by W. M. Pollock. It is 
scarcely to be doubted that Michaux’s var. emersum is the same. 
The riparian, or perpaps rather the subaquatic state which I 
venture to refer here, though possibly erroneously, is from 
Ithaca, New York, no collector’s name being given. 
There is another plant, of the size and habit of the above 
which I dare only designate as a variety of P. coecinea, which 
I may call 
Var. ASPRELLA. Rather larger than the type, especially as to 
foliage; both faces of the leaf roughened with a minute though 
not sparse strigulose hairiness, the veins and veinlets rough with 
an appressed bristly hairiness instead of being merely muricate- 
scabrous; bracts of the spike strigose on the back, and usually 
ciliate with longer hairs. 
The best specimens of this marked variety are from Jackson 
City, near Washington, D. C., by Mr, E. S. Steele, Aug., 1897 ; 
and Dr. Britton has distributed nearly the same from Staten 
Island, N. Y. 
P. PRATINCOLA. Size, habit and general outline of foliage as 
in the last, but pubescence more dense, that of the midvein also, 
of very different character, being long, very straight and closely 
appressed ; spikes not large, also short-peduncled, surpassed 
by the subtending foliage: peduncles glandular-hispidulous; 
bracts of the spike elongated-deltoid, rather densely strigose 
and without obvious ciliation. 
