106 Key to the System of 



517. Ehacheole accessory to the fruit absent or rudimentary. 



Spikes or spikelets one or often more, sometimes abbreviated 

 almost to clusters or headlets ; staminate and pistillate 

 flowers separate, each of the latter representing a much 

 reduced spikelet; utricular covering calyx-like, either con- 

 sisting of one clasping bract, highly connate along its edges, 

 or formed of two bracts completely connate except at the 

 bidenticulated summit ; stamens usually three. Carex. 1996 



Rhacheole accessory to the fruit elongated, exserted 

 and hooked. 



Spike always one, terminal ; staminate and pistillate flowers 

 separate ; rhacheole bare, rigid ; utricular covering as in 

 Carex ; stamens usually three. Uncinia. 2014 



QRAIttlNEAE. 



518. Fruit (grain) one in each spikelet. (Exception : Panicum, 



section Isachne) ... ... ... ... ... 519 



Fruits more than one in each spikelet ... ... 546 



519. Bracts more than three ... ... ... ... 520 



Bracts three ... ... ... ... ... ... 534 



520. Spikelets jointed above the lower bracts ... ... 521 



Spikelets jointed below the lower bracts ... ... 524 



521. Two bracts between the fruit-supporting and the two 



lowest bracts ... ... ... ... ... 522 



No bracts between the fruit-supporting and the two 

 lowest bracts ... 523 



522. The two bracts next to the two lowest bearing stamens. 



Odorous grasses ; spikelets arranged in a panicle ; bracts 

 shining, membranous, transparent ; stamens three ; fruit 

 free within its bracts, but retained by them. 



Hierochloa. 2016 



The two bracts next to the two lowest empty. 



Spikelets arranged in a panicle or in a raceme or a spike, 

 awnless or with one awn ; bracts firm, opaque ; stamens 

 six or four or rarely two. Figure 126. 



(Tetrarrhena. ) Ehrharta. 2017 



