26 



A\ENASTRUM. 



1. Spikelets 6-9 lin. long. Rachilla joints 1^-2 lin. long^ 



hairy 2 



Spikelets 3^-6 lin. long. Rachilla joints ^-1 lin. long 4 



2. Spikelets 2-3 flowered, as long as, or slightly longer than 



the glumes A. quinquesclum, 



Spikelets 3-4 flowered, much longer than the glumes 3. 



3. Panicle 6-9 in. long. Leaves long, flaccid ... A. longum. 

 Panicle 2-3 in. long. Leaves mostly basal, short, sub- 

 rigid A. dregeanum. 



4. Spikelets rather compact, slightly turgid. Valves imbri- 



cate A. lurgiduliim, 



Spikelets looser. Valves not imbricate, spreading, 

 narrow 5 



5. Panicle flexuous. Rachilla long, hairy. Valves thin, 



smooth A. caffrum. 



Panicle narrow, branches adpressed. Valves sub-carti- 

 laginous, below the awn, scaberulous or granulate 6 



6. Blades 9-20 in. by 2-2^ lin. Spikelets 5-6 lin. long. 



Rachilla long hairy A. dodii. 



Blades 2-9 in., very narrow. Spikelets 3|-5| lin. Rachilla 

 glabrous or shortly hairy A. anlarticum, 



BRACIIYPODILM. 



1. Annual. Anthers ^-\ lin. long B. distachyum. 



Perennial. Anthers 1^-2 Un. long 2. 



2. Culms leafy for more than half their length ... B. flexiim. 

 Leaves crowded at the base B. bolusii. 



BRIZA. 



Spikelets 5-8 lin. long B. maxima. 



Spikelets 1-2 hn. long B. minor. 



BRIZOPYRIJM. 



1. Spikelets in 2 ranked spikes or the lower clustered 2 

 Spikelets in spike-like panicles all round the axis ... 4 



2. Glumes and valves subcoriaceous, very obscurely nerved. 



Leaves rigid B. capense. 



Glumes and valves thinner. Nerves prominent in upper 

 part. Leaves glaucous, not rigid 3 



3. Spikelets loosely imbricate, 3^-4 lin. long. Leaves long, 



flaccid B. -aUemans. 



Spikelets tighlly imbricate, 2-2J lin. long. Leaves short. 



B. brachystachyum. 



