., , GRAMINEiB'f 716 



awned hairy palet. 



8 Hierochloa Spikeleta 3-flowered, the lateral ones staminate. 



Tribe y Agrostide^ Spikelets all hermaphrodite and fertile, 

 with 3 glumes, the first 2 empty. Rachella sometimes prolonged 

 behind the palese into a naked or plumose bristle, 



* Flower sessile ■within the glumes. 



9 Coieanthns Spikelets in small umbellate clusters, all perfect. 



10 Sporobplug Spikelets in contracted or open panicles, all perfect. 



* * Flower raised within the glume on a short rounded or stalk- 

 ' like base. ' ; 



Glumes Ipng-awned- 



11 Polfpof^on Glumes much longer than the flower. 



■*- ■<- Gluntes mostly awnlens. 



1 2 Agrostis Lower glumes exceeding the very thin obtuse palets : inflor- 

 escence spike-like to open paniculate. 



13 Gastrididu Inflorescence spike-like : glumes with a shining ventri- 

 cose base. 



11 Clnna Flower distinctly stipitate : flowering glume ahort-awi;ed bs- 

 low the tip. 



15 Mnhlenbergia Flowers mostly bearded at base, early deciduous: 

 flowering glume awned from the apex. 



■»-<-+- Flowers with a more or less conspicuous tuft of hairs at 

 base, shorter than the glumes. 



16 Calamagrostis Spikelets 2-fl6wered a,qd mostly with the rudiments 

 ~ of a second flower present : palet awned from below the apex. 



Tribe IV Chlorides Spikeletsorie, to severail-flowered,in 

 simple one-sided spikes, upon a jointless rachis. 



* Spikelets one-flowered. 



17 Spartina Spikelets much flattened laterally, in 2 rows upon one aide 

 of a 3-angled rachis: spikes racemed. 



18 Beckmannia Spikes panicled : spikelets 2-flowe^ed, or by abortion 

 1-flowered, upon ode aide of a flattened rachis. 



* * Spikelets 2-flowered or more, one flower perfect with one or 

 more imperfect or neutral ones above it. 



19 Bonteloua Flowering glumes 3-cleft and 3-awned at th.e.apez<:'iiu- 

 perfect flowers often reduced to these awns. 



30 Elbusime Spikes digitate fit the summit of the stem ; spikeleta aev- 

 eral-flowered. ■ ' ' ' ' 



Tribe v Stipace^ Spikelets strictly one-flowered. Flowers 

 with a sharp-pointed callus at base, deciduous. Flowering glume 

 wirg,pped around the flower and palet, coriaceous and indurated 

 in frujt and terminated by a simple or triple awn. 



21 Stipa Awn simple, long, twiated below, not caducous. 



22 Oryzopsir -AWn simple, caducous : flower clothed with long silky hairs . 



