358 
FLOItA OF ADEN' 
Tribe 5. Eragrosteae. Spikelets variously panicled, some- 
times spicate or subspicate. Florets usually numerous 
and far exserted from the glumes. Involucral and floral 
glumes somewhat similar in general appearance. Floral 
glumes membranous or chartaceous, entire or 2-3-cleft, 
3-nerved, the nerve evanescent above or excurrent into 
bristles; side-nerves usually submarginal, glabrous or 
pubescent or finely ciliate below. Palese often persistent or 
subpersistent. 
Upper involucral glume 3-nerved : 
Spikelets usually panicled, rarely in simple spikes. 
Rhachilla often persistent. Valves usually numerous 
and closely imbricate, broad, entire, awnless 
Spikelets crowded on and falling entire from the flattened 
axis of stiff spreading secund, spikes, which are closely 
arranged on a long common axis .... 
Upper involucral glume 5-nerved .... 
Tribe 6. Chloride®. Spikelets usually in 2-ranked seeund 
spikes or spike-like racemes, rarely distinctly pedicellate and 
paniculate. Florets lto many. Floral glumes usually 
membranous, truncate, emarginate or toothed, 3-n erved ; 
nerves distant, subparallel, distinct, percurrent or 
excurrent, and often ciliate all along, the lateral submargi- 
nal (in JEleusine there are sometimes additional side- 
nerves close to the middle nerve of the glume). Awn, if 
present. Straight, usually from a truncate or toothed tip. 
Floret 1, awnless . . ..... 
Florets several, one hermaphrodite, the others | male or 
barren ... ..... 
Several to many hermaphrodite florets in each spikelet 
Tribe 7. Pappophorese. Floral glumes broad, 5-many-nerved, 
cleft into 3-many subulate lobes with or without alter- 
nating flue straight awns from the sinuses. 
Floral glumes 9- cleft ....... 
Tribe 8. Festucese. Involucral glumes more or less 
resembling the floral ones in general appearance. 
Fruiting florets 2 to many (very rarely 1), often much 
exserted from the glumes. Floral glumes 5-or more- 
nerved, rarely 1 — 3-nerved. Awns, if present, terminal 
subterminal, never geniculate. 
Leaves narrow, less than 2 inches long, rigid, pungent . 
10. Eragrostis. 
11. Desmostachya. 
12. Halopyrum. 
13. Cynodon. 
14. Chloris. 
15. Eleusine. 
16. Enneapogon. 
17. Aeluropus. 
