20 
CLYII. GRAMINE^ (Stapf). 
Spikelets much over 1 mm. long, subsessile or pedi- 
celled in often flexuous spike-like racemes or in 
short contracted panicles ; valves often dark... 120. Diplachne. 
Spikelets rarely much over 1 mm. long, sessile or the 
lowest subsessile in very slender spikes on a long 
common axis ; valves usually pale with green 
nerves ... 121. Leptochloa. 
Tribe XII. CHLORIDES. — Spikelets sessile or subsessile in 2-ranked, secund, 
usually very dense, rarely loose spikes (or spike-like racemes), or the spikelets 
more or less pedicelled and panicled (Triraphis) ; spikes solitary or digitate 
or racemosely arranged on a common axis, rarely in a spike-like panicle 
(Leptocarydion) or reduced to'a fascicle of a few spikelets (Melanocen- 
chris). Valves generally membranous to chartaceous, entire, emarginate or 
2- to 4:-lobed, %-nerved, nerves subparallel, distant, the lateral submarginal 
and usually ciliate or villosulous (additional side-nerves close to the middle- 
nerve occur in Eleusine sp. ) awn, if any, straight, fine, from the truncate 
or .notched tip or all 3 nerves running out into mucros or aums (Melanocen- 
chris, Triraphis). 
Valves entire, emarginate or more or less 2-dentate or 
2-lobed, muticous or with the middle nerve run- 
ning out into an awn or mucro (see also reduced 
forms of Tripogon) : Sub-tribe Chloridince. 
Spikelets 1 -flowered without any imperfect florets 
above or below the fertile, very rarely 2- or sub- 
2 -flowered with a glabrous <$ or barren floret 
above the hairy $ (Microchloa sp.), with or with- 
out a bristle-like continuation of the rhachilla. 
Spikelets with long flexuous awns in dense digitate 
spikes 122. Schcenefeldia. 
Spikelets awnless or very shortly aristulate. 
Lower glume boat-shaped or much reduced or 
quite suppressed ; upper with a broad flat 
back. 
Spikes solitary. 
Spikelets more or less immersed in the hol- 
lows of the rhachis ; lower glume much 
reduced or 0 
Rhachis very fragile ... ... ... 123. Lepturella. 
Rhachis tough 124. Oropetium. 
Spikelets unilateral on a flattened rhachis ; 
lower glume as long as or slightly longer 
than the upper 125. Microchloa. 
Spikes several, more or less distant on a com- 
mon axis. 
Lower glume delicate, hyaline ; floret 
almost as long as the spikelet ... 126. Willkommia. 
Lower glume almost as firm as the sub- 
chartaceous upper; floret much shorter [eras, 
than the glumes ... ... ... 127. Craspidorha- 
Both glumes laterally much compressed, keeled. 
Glumes longer than the floret, enclosing it ; 
spikes digitate, rarely solitary ... ... 128. Brachyachne, 
Glumes shorter than the floret ; spikes 
always digitate ... ... ... ... 129. Cynodon. 
Spikelets with several florets. 
Spikelets with 1 (rarely 2, Chloris sp.) fertile and 
