POLYGONACEOUS GENERA. 49 
and almost floating branch, and the riparian firm and leafy one 
growing from the same half-submersed and half-emersed pros- 
trate main stem. 
From other parts of Nevada, and from Utah, material 
mostly fragmentary exists in the herbaria under the name of 
P. Hartwrightii, a part of which seems referable to the present 
species. 
P. vILLosuLA. Riparian or subaquatic, a foot high, with 
oblong-lanceolate acutish 5-inch-long lower leaves glabrous 
throughout and probably at first floating, though short-petioled; 
the upper nearly as large, far surpassing the flowers, oblong 
obtuse, with subcordate base, sparsely and rather softly hairy on 
both faces, the midvein beneath hirsute with long spreading 
hairs; ocrex, petioles, even the upper part of the stem villous- 
hirsute, not glandular; spikes small, oval; bracts hirsute. 
Granite Station, Kootenai Co., Idaho, 30 July, 1892, J. H. 
Sandberg, in U. S. Herb. under the collector’s n. 807. The 
herbaceous border of the ocrex present but narrow. 
P.CHELANICA. Riparian, with the subsessilespreading foliage 
of P. Hartwrightit but destitute of the herbaceous rim : leaves 
small, the largest 3 or 4 inches long, lanceolate, subcordate, 
very short-petioled, not canescent though sparsely and finely 
strigulose on both faces, the midvein beneath clothed with 
coarser straight appressed hairs, these short, not thickened at 
base; ocreæ more densely and coarsely strigose; peduncle gland- 
ular-hispidulous, about 1 inch long, the narrow and linear spike 
somewhat longer; bracts sparsely bristly-ciliate and with a few 
short bristly hairs on the back. 
On sandy bars along Lake Chelan, Washington, July, 1897, 
A. D. E. Elmer, n. 857 asin U. S. Herb., named Z. Hart- 
wrightii, but its relationship to that species not is manifest. 
P. GRANDIFOLIA, Greene, Leafl. i. 37. Without the least 
knowledge of its inflorescence or flowers, and upon characters of 
foliage and pubescence, I published this with the fullest confi- 
dence in its validity as a species. And now, from only a short 
distance above La Crosse, the once for my sterile type spec- 
Lë 
LEAFLETS, Vol. i, pp. 49-64, Aug. 25, 1904. 
