12 
CLVII. GRAMINEiE (Stapf). 
Lower glume coriaceous with a herbaceous beak ; pair 
of racemes terminal on the culms and their distant 
1-3 branches, long-exserted from the supporting 
sheath, one subsessile, the other long-peduncled, 
both reduced to two pairs of large homogamous £ 
spikelets and one heterogamous pair, surrounded 
by them as by an involucre ... ... ... 44. Exotheca. 
n. Anadelphiastrae. 
Racemes of 1 to many sessile and as many (or more by 
one) pedicelled spikelets. 
Sessile spikelets numerous (6 to very many), more or 
less imbricate owing to the short joints ; the 
racemes enclosed, except the pedicelled spike- 
lets, in a large coloured boat- shaped spathe, 
arranged in a simple, very loose panicle ... 45. Monocymbium. 
Sessile spikelets few (1-5), not closely imbricate 
owing to the elongated joints ; spathes narrow 
with the racemes laterally or terminally ex- 
serted 46. Anadelphia". 
Racemes reduced to a single $ spikelet ; habit of 
Anadelphia 47. Monium. 
o. Heteropogonastrae. 
Spikelets all pedicelled, the secondary all alike and 
fertile, the primary £ ; rhachis of raceme tough 48. Trachypogon. 
Secondary spikelets sessile, those of the lower 1 or 
several pairs £ or neuter, and different in shape # K C * 
from those of the upper pairs, the latter fertile. 
Pedicelled spikelets suppressed with the exception 
of those of the lowest and uppermost pair which 
are rudimentary 49. Homopogon. 
Pedicelled spikelets of all pairs developed, £ or 
neuter 50. Heteropogon. tf(Q 
p. Themedastrae. 
Only tropical African genus 51. Themeda. ^ !S 
Tribe III. PANICEiE. — Spikelets in usually continuous spikes, racemes or 
panicles. Glumes herbaceous or membranous, the lower generally smaller, 
very small or suppressed. Lower valve generally resembling the glumes in 
structure and nervation, the upper fertile firmer, at length rigid, often char- 
taceous to crustaceous, awnless, very rarely mucronate (Urochloa, Allote- 
ropsis sp.) or finely awned (Alloteropsis sp., Coridochloa). 
Key to the Sub-tribes and Groups of Genera. 
Upper floret only fertile ; valve of lower floret usually 
resembling the upper glume, not indurated : — Sub- 
tribe Panicince. 
Inflorescences of usually slender (stout in Allote- 
ropsis), spiciform, digitate or subdigitate or 
somewhat distant and quaquaversally arranged, 
very rarely solitary racemes ; fruiting valve with 
usually flat, thin to hyaline margins, thinly car- 
tilaginous, often brown or dark, with the usually 
minute, often microscopic, scale-like valvule of 
the barren floret attached to its base ... ... a. Digitariastrae. 
