48 LEAFLETS. 



hairs, glabrous beneath except as to the strongly muricate mid- 

 vein ; ocreae 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, 36 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. HOMALOSTACHTA. 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 3 J 

 inches long, on petioles of an inch, acute or obtuse, the base 

 rarely subcordate ; ocrese hyaline, without border : spikes com- 

 monly %, 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 4 J inches long. If in breadth, commonly glabrous on 

 both faces, the more lanceolate often 5 J inches long, sparsely 

 rough-hairy above, more densely so beneath ; the midvein dis- 

 tinctly and harshly hirsutulous, all short-petioled, the ocrese 

 Bcaberulous, 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 ; ocrese 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 



