23 



28. Culms rather slender. Panicle narrow. Common* 



peduncles curved A. dregeanus. 



Culms stout. Panicle decompound. Common peduncles 

 not so strongly curved 2 ( J 



29. Common peduncles enclosed or laterally exserted. Hairs 



if present whitish A. schimperL 



Common peduncles usually long exserted. J lairs if, 

 present rufous A. riifus. 



30. Hermaphrodite spikelets subtended by a bract-like- 



appendage A. riiprechti. 



No scarious bract-like appendage 3:1 



31. Racemes 5-6 tin. long, each with 1 hermaphrodite 



spikelet A. filipendulus. 



Racemes 6-12 lin. long, with more than I hermaphrodite 

 spikelet 32 



32. Culms simple. Racemes (J-S lin. long... A. transvaalensis.. 

 Culms branched all along. Racemes about 1 inch long. 



A. pleiarlhroiK. 

 ANTHEPHORA. 



Perennial. Involucral glume minutely tubercled and 

 villous outside. Lower valve 5-7 nerved ... 



A. pubescens. 



Annual. Involucral glume glabrous except at the base. 



Lower valve 3 nerved A. undulatifolia. 



AMIIOXANTIIUM. 



1. Panicle small or reduced to a scanty raceme. Culms and 



leaves very small, weak A. tongo. 



Panicle spike-like. Culms erect, t-3 feet long 2. 



2. Spikelets pallid, 4 lin. long. Lower glume i nerved ... 



A. ecklonii. 

 Spikelets greener, 3 lin. long. Lower glume 'A nerved ... 



A. dregeanuni.. 

 ARISTIDA. 



1. Awns glabrous. Glumes 1 nerved 2: 



All or only the middle bristle of the awns plumose. 



Glumes 3 nerved 14 



2. Awns disarticulating from the valve, distinctly stipi- 



tate :". ... 3 



Awns not disarticulating, but sometimes jointed just 

 below the branching point 6 



3. Glumes aristulate. Foot of the awn 8-20 lin. long ... 



A. sieberiana.. 

 Glumes not aristulate. Foot of the awn 1-6 lin. long 4 



