48 LEAFLETS. 
hairs, glabrous beneath except as to the strongly muricate mid- 
vein; ocreæ also muricate and more or less hirsute, the very 
broad herbaceous border crisped and setose-hairy; peduncle of 
the short thick cylindric spike glabrous, sharply many-angled ; 
flowers pale, merely pink. 
Near New Windsor, Colorado, 26 July, 1901, Geo. E. Oster- 
hout, the type in his herbarium. A luxuriant ally of P. Hart- 
wrightii; leafy but sterile branches overtopping the solitary 
spikes. 
P. HOMALOSTACHYA. Aquatic state seen only in shallow 
water, with stems barely a foot long; nodes not swollen, inter- ` 
nodes 1 to 2 inches long: leaves thin, oblong-elliptic, 2 to 33 
inches long, on petioles of an inch, acute or obtuse, the base 
rarely subcordate ; ocrex hyaline, without border: spikes com- 
monly 2, short-peduncled, oval or oblong, narrowly cylindric. 
Moist-land state much larger, often 2 feet high, copiously 
leafy, the leaves from elliptic to lanceolate, the largest and 
elliptic 43 inches long, 1? in breadth, commonly glabrous on 
both faces, the more lanceolate often 53 inches long, sparsely 
rough-hairy above, more densely so beneath; the midvein dis- 
tinctly and harshly hirsutulous, all short-petioled, the ocrex 
scaberulous, ending in a broad lobed and crenate as well as hir- 
sute-ciliate herbaceous rim: spikes quite as in the aquatic state, 
never elongated and linear, short-peduncled, never even nearly 
equalling the foliage. 
Sterile dry-land state a foot high, decumbent, densely leafy, 
much more strongly pubescent, the elliptic-lanceolate subsessile 
ascending leaves 2 to 5 inches long, rather bright-green but 
scabrous-strigose on both faces, the midvein beneath sparsely 
but stiffly hirsute, with slightly retrorse hairs; oeren very hir- 
sute, their broad rim as in the floriferous terrestrial state. 
The type specimens of this fine species consist of seven 
mounted sheets collected by myself in and around a large shal- 
low lake near Perry’s in Pine Valley between Palisade and Eu- 
reka, Nevada, 25 July, 1896. Different though the three dis- 
tinct phases of this appear, both as growing, and as mounted 
in the herbarium, my types in two instances show the aquatic 
