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. Awn terminal, long and straight, empty glumes minute. 
44. Bra 
. Empty glumes two 
. Spikelets articulated with th ee eee 
58 
7. Flowering glume much firmer in texture than the empty ones, 
indurated at maturity, when it loosely envelops the grain. 
ORyYZOPSIS 
; gees iste: glumes similar in texture to aes empty ones, not in- 
urated in fruit. (Section Vilfze of Sporobolus, may be looked 
ie here) 53. EPICAMPES 
Rachilla prolonged behind the palea 9 
. Rachilla not prolonged behind the palea 11 
CHYELYTRUM 
Awn from between the teeth of the bifid apex of the flowering 
glume, short or redticed to a simple mucro...-..-.----- 10 
Callus of - noises glume and p g of the rachilla 
naked; icles loose or ex anded Wis stg ag 57. CInNA 
Callus and ‘prolongation of the rachilla hairy; panicles dense 
and spike-lik 61. AMMOPHILA 
. Empty glumes none; spikelets minute in small umbel-like 
clusters 49. ScHMIDTIA 
1 
: aoe meee papacetee with the jpeg below the firm and 
mpty glumes, falling off entire ...-- 55. LrmnoprEa 
me: Soikeioe ses Sesind with the seals below the empty 
glumes; flowering glumes 3-nerved and much firmer in tex- 
of Sporobolus may be looked for here).. $8. MuUHLENBEKGIA 
which are much longer than the flowering glume. 
OLYPOGON 
i seein not articulated with the pedicels beet i empty 
glum: 14 
. Empty glumes saccate at the base, several times longer than the 
flowering glumes; inflorescence contracted and spike-like. 
59. GASTRIDIUM 
. Empty glumes not saccate at the base, and if longer than the 
_ flowering glume, never exceeding it by more than pensar 
or one-hal 
. Rachilla prolonged behind the palea 16 
5. Rachilla not pasty behind the palea. 17 
Callus f tha fi 
sroleciation of the rachilla 
sree bio glumes penal pe pa poner - 
