23 



28. Culms rather slender. Panicle narrow. CommorE. 



peduncles curved A. tlregeaniis^ 



Culms stout. Panicle decompound. Common peduncles, 

 not so strongly curved 29 



29. Common peduncles enclosed or laterally exserted. Hairs- 



if present whitish A. schimperi- 



Common peduncles usually long exserted. Hairs it 

 present, rufous A. rufus. 



30. Hermaphrodite spikelets subtended by a bract-like. 



appendage A. riiprechti.. 



No scarious bract-like appendage 3i 



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



spikelet A. t'ilipeiiduliis. 



Racemes 6-12 lin. long, with more than 1 hermaphrodite, 

 spikelet 32- 



32. Culms simple. Racemes 6-8 lin. long. ..A. transvaalensis.. 

 Culms branched all along. Racemes about 1 inch long. 



A. pleiarthron^ 



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.. 



AMHOXANTHUM. 



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



leaves very small, weak A. tongo> 



Panicle spike-like. Culms erect, 1-3 feet long 2- 



2. Spikelets pallid, 4 lin. long. Lower glume 1 nerved ... 



A. ecklonii- 

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



A. dregeanum, 



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 a 



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 hot aristulate. Foot of the awn 1-6 lin. long 4 



