592 FLORA OF TEXAS. 



Tribe III. Chlorideae. Spikelets 2-several-flowered 

 in 1 -sided spikes. Rachis }0\\\tQ(X. t^j|/?er flowers imperfect. 

 Glumes and jt?«?^^ 2. Spikes racemed'or digitate, rarely 

 single. 



* Spikelets Z-Z-Jlotoered, only the lowest flower j:)erfect. 



Spikelets linear^ scatlei'ed. Lower palea and rudiment awned. Spikes racemed. 



Gymnopogon. 

 7-onndish, crowded. nmc7'onate. Spikes digitate . .Bvstacsys. 



Lower palea awnless. Culms creeping. Spikes digitate Ctnodon. 



** Spikelets mostly several-flowejed the lower flowers perfect. 



Spikes digitate. Upper glumes awned. Palece pointed DACTYi.ocTENn7M. 



Glumes and palece awnless Eletjsine. 



racemcdy long and sknder. Glumes awnless Leptochloa. 



Tribe IV. Festucacese. Spikelets panicled, few- 

 many-flowered, the upper flowers imperfect. Glumes 2. 

 Palece 2, membranaceous or rarely indurated, awnless, or 

 the lower one with a straight awn at or near the apex. 

 Stamens 1-3. 



* Grain smooth, free from the palecB; lower flowers perfect. 



t Lower palea 5-5-toothed or awned. 



Sjnkdets h-1-flowered. Lower palea slightly deleft, the 3 hairy nerves percurj'ent. 



Tkicuspis. 



t+ Lower palea entire, awnless or awn-jmnted. 



X Glu?nes unlike, the lower one linear, the upper obovate. 



Spikelets 1-b-flowered. Culm^ slender, tufted Eatonia. 



XX Glumes alike ; lower palea rounded on the back, not keeled. 



Spikelets Z-hfloioered. Lower palea many-nerved Melica. 



Spikelets ^-many-flowered. Lower palea st7'ongly Inei'ved Glycema. 



Spikel'fs looxely many-flowered. Culms woody Arundinaeia. 



Spikelets dioecious. Lower palea Hgid BRizopYRUir. 



XXX Glumes alike ; lower palea keeled. 



Palece falling aio^y ttqdh'r, the lower one 5-nerved, and with cobwebby hair'f at 



the base. Spik(let<! 3-C}-flowered Poa. 



Lower palea falling before the upper one, S-nerved, not hairy Eragrostis. 



awn-pointed. Panicle contracted, composed of l-sided clusters. 



Dacttlis. 



