te 
552 GRAMINES (Stapf). [ Aristida. 
terete, sometimes grooved, tightly embraced by the valve; hilum 
linear, almost as long as the grain ; embryo short or long. 
igen or more often phate nial, tufted, psa with more or less wiry culms; 
bl xies ually wie pap ligule usually a line of very short oo 3 
panicle Sahee ‘en cates -like to effuse 
Numerous agp in the dry ie warm regions of both hemispheres. 
Sec Cu Awns continuous with the valve, or articulated just 
below their te gait but not desis glabrous; glumes 1-nerved. 
*Awns paises cat wit valve 
ual (at least in the Soath ‘Aion sciesinscsih 
vale as in profile, Peto gia above, not 
pert d ; apn +. a ... (1) Adscensionis. 
Perennial ; ore or Rerrs cylindrical, 
narrow cai in oo and 
usually twisted beaks poli 1-3 Tin. 
Panicle contr rrow ee re. 
2-toothe — awns suberect, : 
10-15 lin, ong (2) equiglumis. 
ir sone awns more or less 
Calis ies aor 5-6 lin. 
ong; valve exserted from the 
hoetly mueronate glumes ; 
n 5-7 lin. long (3) angustata. 
Cus distinctly compressed 
below ;_ spike 34-14 lin 
lon ay valve geo ex xsert 
from the long poner 
aristulate glumes 3; awn 7-1 f 5 
lin mn (4) junciformis. 
Culms with pie A ‘adpress ool 
below the nodes, sor stout ; Scale 
1-1} ft. long ... (5) Seiurus. 
Panicle pet. lax ; ‘branches 3-6 in. lon ng: 
Blades 8-12 in. long ; branchlets of 
nice depttiad, flexuous; spikelets 
ms age gam nodding ; awns ¢ 
(6) Burkei. 
Bias rs in. . Tong 5 spikelets 3-4 lin, 
med 1-3 at the tips of regh divari- : : 
branchlets; awns 4 lin. long ... (7) bipartita. 
**Awns netienlated ‘with ee valve ree below their 
bran  wgg Ah not deciduous; perennial : 
. 
> 
ed at the mouth: panicle simply 
spike-like or with 12 — led sear 
false spikes at ion _ (8) congests- 
hs bea outh ; panicle com posed 
‘ot a long) petunclot false — ovate to (9 collis. 
‘ ) b 
THRATHERUM. Ans dinatinalssing hace the a n aiatiuclls 
ont pr sai — 1-ne 
Panicle usually contracted ; — Bere ee 
filiform, short ; yo ers s up to 10 (ex- 
clusive of ~ ae erate eatiaetina: fe of awn 
8-20 lin. lor : .. (10) sieberiana. 
