124 NEW YORK STATE MUSEUM 



Sterile spikes 1-5, stalked or sessile ; fertile spikes 2-5, cylin- 

 drical or ovoid, densely flowered, approximate above and distant 

 and remote below, short peduncled or sessile, erect or the lower 

 sometimes long-peduncled and spreading; bracts shorter or 

 longer than the culm ; perigynia ovoid or oblong-conical, nerved, 

 densely hairy or smooth, with a short bidentate beak ; mostly 

 coriaceous in texture, (granular dotted and thin in 103). 99-106. 



Sterile spikes 1-5, stalked ; fertile spikes 2-5, cylindrical, densely 

 or subdensely flowered, erect on short stalks or sessile ; perigynia 

 ovate lanceolate, smooth or hairy, with a long tapering deeply- 

 cleft heah, the awn- like teeth mostly recurved ; perigynia not 

 reflexed. 107-109. 



Sterile spike single ; fertile spikes 2-4, cylindrical, on long 

 drooping peduncles ; perigynia narrowly lanceolate, with a long 

 deeply-cleft beak, the awn-like teeth spreading or recurved ; 

 perigynia strongly reiiexed at maturity. 110-111. 



ft Perigynia much inflated. 



Sterile spike solitary, (very rarely 2), stalked ; fertile spikes 

 2-5, cylindrical, densely flowered, the upper 2 sessile or nearly 

 so, ascending, the others subdistant, short-stalked and horizon- 

 tally spreading or all separate on drooping peduncles, the lowest 

 sometimes remote, 2' long or more, 5"-6" wide ; perigynia ovoid, 

 nerved, with a long bifid beak, horizontally spreading at matu- 

 rity, having a comose appearance. A mountain species (114) has 

 1-3 straw-colored spikes, sessile, erect or ascending, 3" wide, with 

 ascending perigynia. 112-114. 



Sterile spike long and sometimes long-peduncled ; fertile spikes 

 l^'-Si' long, 9"-12" wide on stiff erect stalks or sessile; perigynia 

 ventricose and stijntate, G" in length or more. Spikes hop-like in 

 aspect. 115-116. 



Sterile spike single (sometimes 2 in 122), stalked or sessile ; fer- 

 tile spikes 1-6, globular, ovoid or oblong, compactly or loosely 

 flowered, the upper two sometimes contiguous, the others sep- 

 arate, or all distant or remote, sessile or pedunculate, rigidl}'" 

 erect, bright or yellowish green ; bracts with or without sheaths, 

 mostly surpassing the culm ; perigynia ovoid or lanceolate from 

 an ovate base, or awl-shaped, nerved, smooth, with a long taper- 

 ing hidentate, or short notched heak, horizontally spreading or 

 reflexed at maturitv. 117-125. 



