POLYGONACEOUS GENBEA. 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; ocreaa, 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 TJ. S. Herb, under the collector's n. 807. The 

 herbaceous border of the ocrese present but narrow. 



P. Chelanioa. Eiparian, with the subsessile spreading foliage 

 of P. Hartwrightii 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; ocrese more densely and coarsely strigose; peduncle gland- 

 ular-hispidulous, about 1 inch long, the narrow and linear spike 

 somewhat longer; bracts sparsely bristly-cili.ate 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 as in U. S. Herb., named. P. Hart. 

 wrightii, but its relationship to that species not is manifest. 



P. GEANDISOLIA, 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 station for my sterile type spec- 



Lbaflbts, Vol. i, pp. 49-64, Aug. 25, 1904. 



