54 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



and j^/o; Jack Creek, July 15, 1897, Rydhcrg & Bcsscy, jdyj ; 

 Spanish Basin, July 11, 36 J2. 



* Panicularia nervata rigida Nash. 



Differs from the type in its lower (3-5 dm. tall) and more rigid 

 culms, its shorter erect firm leaves, and its more constricted smaller 

 panicle with shorter and almost erect branches. 



Near springs at an elevation of 2000-2500 m. 



Montana : Lima, June 29, 1895, P. A. Rydbcrg^ 2068 (the type : 

 distributed as " Glycen'a nervata stricta Scribn.,"but this name is 

 invalidated by the earlier Glyceria stricta Hook.). 



Yellowstone Park: Mammoth Hot Springs, 1885, Tzveedy, 



594' 



* Panicularia elata Nash. 



Culms 1-1.5 m. tall, smooth and glabrous ; leaves 5-7 ; sheaths very 

 rough, nearly equalling to exceding the internodes, loosely embracing 

 the culm : ligule scarious, 2 mm. long, truncate at the apex ; blades 

 lax, very rough on both surfaces and on the margins, linear, acumi- 

 nate at the apex, 2—4 dm. long, 6-10 mm. wide ; panicle loose and 

 open, its branches usually in pairs, finally widely spreading, the lower 

 ones 1-1.5 ^"^' long '^"'^ frequently reflexed, the}- and their primary 

 divisions dividing from and above the middle; spikelets 3-4 mm. 

 long, ovate, on pedicels usually shorter than themselves ; scales 6 or 

 7, the lower 2 empty, much smaller than the others, hyaline, often 

 tinged with purple, rounded at the apex, i-nerved, the flowering 

 scales about 2 mm. long, very broad, 7-nerved, the nerves distinct at 

 the base but becoming less manifest above the middle and vanishing 

 below the summit; palet a little exceeding the scale; grain oval, 

 about I mm. long. 



In shaded alder bogs at an altitude of 1500-2500 m. 



Montana: Sweet Grass Canon, Crazy Mts., Sept. 1896, ,/. H. 

 Flodman^ iy6 (the t3'pe) ; Rvddero; 3441. 



Idaho: Forest, Nez Perces Co., July 14, 1896, A. A. & E. G. 

 Heller, 34-24. 



Yellowstone Park: Pelican Creek, 1885, Tzvcedy, 3^3. 



Panicularia Americana (Torr.) MacM. Met. Minn. 81 [111. Fl. i: 



212]; Poa aqiiatica Americana Torr. Fl. U. S. i: 108; 



Glyceria grandis S. Wats, in A. Gra}', Man. Ed. 6, 667; G. 



aquatica Coulter, Man. R. M. 423. 



Common in water within the plain and prairie regions, extending 

 in the valleys to an altitude of 1500 m. 



