GRAMINEAE 



Second glume equalling or longer than the first 

 floret; awns, when present, usually on the back 



of the lemma III. Aveneae 



DD. Spikelets 1-fld. 



Spikelets disarticulating above (below in Alopecurus, 

 Polypogon, Phaenosperma and Sphaerocaryum) the 

 glumes; lemmas either similar in texture to the 



glumes or thicker than the latter at maturity VI. Agrostideae 



Spikelets disarticulating below the glumes; lemmas 



hyaline or thinner than the glumes VII. Zoysieae 



A A. Spikelets 2-3-fld.; the terminal floret perfect (except in sterile 



spikelets), the rachilla never prolonged behind the upper palea. 

 E. Spikelets 3-fld.; florets disarticulating above the 



glumes B. PHALARIOIDEAE 



Spikelets 3-fld., or if 1-fld., the lateral florets 

 represented by 2 scale-like lemmas; glumes 

 well-developed or sometimes exceeding the 



terminal floret VIII. Phalarideae 



Spikelets 1-fld.; glumes minute or obsolete. 

 Spikelets perfect, laterally compressed; glumes 



reduced or wanting; lemmas rigid IX. Oryzeae 



Spikelets unisexual, the pistillate awned, the 



staminate awnless: stamens 6 or more X. Zizanieae 



EE. Spikelets 2-fld.; florets disarticulating below the 

 glumes (except in Isachne and in the tribe 



Arundinelleae) C. PANICOIDEAE 



F. Lemma and palea indurate or membranaceous, 

 thicker than the glumes (except in Pseudo- 

 r aphis of Paniceae). 

 Spikelets disarticulating below the glumes . . XI. Paniceae 

 Spikelets disarticulating above the glumes . . XII. Arundinelleae 

 FF. Lemma and palea membranaceous or hyaline, 

 thinner than the glumes. 

 Spikelets perfect or the fertile ones mixed 



with the sterile XIII. Andropogoneae 



Spikelets unisexual, the staminate and pistillate 

 in separate infls. or in different parts of 

 the same infl XIV. Maydeae 



Subfamily A. FESTUCOIDEAE 



Spikelets many-l-fld., with sterile florets (when present) above the fertile, laterally 

 (rarely dorsally) compressed or subterete, disarticulating above (rarely below) the 

 glumes, the rachilla frequently prolonged behind the upper palea. 



Tribe I. Bambuseae Bamboo Tribe ftjfe (Chu Ts'u) 

 Spikelets many-2-fld., the florets perfect or the upper ones in ours rudimentary, 

 the rachilla disarticulating above the glumes and between the florets, prolonged behind 

 the upper palea into a naked or glumiferous stipe; glumes 2-1, rarely more or want- 

 ing, shorter than the succeeding lemmas; lemmas many-nerved, awnless or with short 

 straight terminal awns; palea 2-keeled or rarely convolute; lodicules usually 3; stamens 

 6 or 3; styles 3-2, often grown together at the base; fr. free, in ours a true caryopsis: 



435 



