GKAMINACEAE 



51 



b. Spikeleta in the same infli 



Pistillate ipikeleti below, surrounded bj an ivory-like involucre 

 Pistillate ipikeleti above, without ivory like involu 

 2. Spikelets :ill perfect or oi two kind-, perfect and itaminate or nidi- 



incut. u v 



a. Spikeleta in different inflorescences, the itaminate in tassels, pistillate in 



the other imperfect and stalked 



b. Spikeleta all alike 

 (1) Glnmes .? 4 



(a) Glomes shorter than the fertile lemma and palet, both lemma 



and palet indurated in fruit 



(b) Outer glumes enclosing the lemma and palet, lemma only in- 



durated in fruit; third and fourth glumes small or rudimentary 

 and hair like 



2 Glo 



(a) Spikelets in onesided spikes 



(b) Spikelets not in one-sided spikes 

 x. Spikelets 1 -flowered 



(x) Glumes small or minute 



(y) Glumes variable, mostly as long or longer than lemma 

 y. Spikelets 2-many-flo\vered 



(x) Spikelets sessile on the main zig-zag axis 



(y) Spikelets more or less stalked, main axis not zig-zag 



m. Glumes enclosing the spikelet, lemma usually awned on the 



back 

 n. Glumes not enclosing the spikelet, lemma awnless or awned 

 at the top 

 (3) Glumes none 

 II. Plants with tall woody stems or canes 



Artificial Key 



I. Spikelets in panicles (or cylindric spikes) 

 1. Spikelets one-flowered 

 a. Three or four empty glumes 



Coix in May 



Zizaina in (>>} 



AnJropogoneae 



Panic cae 



Phalaridcae 

 Chloridcae 



Oryza in Oryzeae 

 Agrostidcae 



Hvrdcae 



Avcneae 



Festuceae 



Oryzeae 

 Bambuseae 



Panic cat 



AgTOStideae 



Agrostis vulgaris, panicle and rpikelet 



b. Two empty glumes 



(1) Flowers naked at base, or with one hairy bristle 



(2) Flowers with two scales or bristles at base 



c. No empty glumes 



Panlceae 

 Echinochloa crusgalli: spikelet 



Agrostideae 

 Phalarideae 

 Oryzeae 



