CLVII. GRAMINE^) (Stapf). 
19 
Glumes smooth, the upper curved and subulate- 
cuspidate ; spikelets 2 or 3 in minute deci- 
duous spikes, the uppermost always barren ... 110. Dignathia. 
Glumes drawn out into a long line awn. 
Spikelets solitary, glabrous, awn many times longer 
than the body of the .spikelet ; spikes usually 
long 111. Perotis. 
-H 
Spikelets not solitary. 
Spikelets in pairs villously plumose below ; spike 
short; both glumes developed, equal ... 112. Tetrach^te 
Spikelets 4-5 in short deciduous spikes, densely 
crowded on a long common axis, the lower 1 
or 2 only fertile ; lower glume suppressed ... 113. Monel ytrum. 
- b. Awn of the fertile floret, if present never kneed and twisted below the 
knee (114-170). 
i. Valves typically 3-nerved (114-143). , 
Tribe X. SPOROBOLEiE . — Glumes and valves very similar. Floret 1. Rha- 
chilla very rarely continued beyond the Horet. A Valve membranous, acute 
or obtuse, not changed when ripe, 1- or more or less distinctly 3-nerved, 
awnless, usually olive-green or olive-grey ; side-nerves, if present, delicate, 
evanescent above. Seed often free in the delicate pericarp. 
Only genus 114. Sporobolus. 
Tribe XI. ERAGROSTE/E . — Spikelets pedicelled and variously panicled, or 
sessile or subsessile in spikes (or spike-like racemes) which are racemosely 
arranged on an elongated common axis, rarely in a simple raceme (Har- 
pachne). Florets usually numerous (1 in Leptochloa sp.) and far ex- 
serted from the glumes. Glumes and valves rather similar in general appear- 
ance. Valves membranous to subcoriaceous, very often olive-green or olive- 
grey, entire or slightly emarginate with the nerves evanescent above or per- 
current to obscurely excurrent, muticous, mucronulate, very rarely with a 
very short awn from below the tip (Diplachne sp.). 
Valves entire, emucronate, usually glabrous, very rarely 
ciliate ( Erasgrostis sp.), often rather firm. 
Spikelets in a rigid solitary raceme, pedicelled, 
spreading, falling entire with the pointed pedicel 115. Harpachne. 
Spikelets not deciduous as a whole from the axis of a 
solitary raceme. 
Spikelets in more or less rigid secund, straight or 
curved spikes ; valves acute or acuminate. 
Spikes usually curved upwards, in irregular 
spirals ; spikelets breaking up between the 
florets with the tips of the joints bearded 116. Pqgonarthria. 
Spikes straight, crowded into a long narrow 
dense panicle ; spikelets very closely 
packed, laterally very much compressed, 
falling entire from the very slender rhachis 117. Desmostachya. 
Spikelets pedicelled, usually panicled, rarely in •'^ • ^'7/. 
solitary terminal, more or less secund spikes. 
Lower glume 1-, upper 1-3-nerved ; valves 
moderately rigid ; rhachilla glabrous ... 118. Eragrostis. 
Lower glume 3-, upper 5-nerved ; valves sub- 
coriaceous ; tips of rhachilla- joints bearded 119. Halopyrum. 
Valves usually emarginate and mucronulate, rarely 
entire and muticous or with a very short awn from 
below the tip, frequently more or less hairy near 
the base or along the sides. 
