16 
CLYII. GKAMINEiE (Stapf). 
Spikelets in cylindrical false spikes with a 
stout rhachis, more or less gibbous ... 74. Sacciolepis. 
All the spikelets or only the upper of each branch 
supported by bristle-like branchlets 75. Setaria. 
c. Meliniastrae. 
Upper glume and barren valve gibbous at or below the 
middle, both 5-nerved ; nerves faint, hidden by 
copious and long silky hairs and anastomosing 
below the obtuse tips 
Upper glume and barren valve not gibbous. 
Nervation of glume and barren valve as in r F<nch& 
k&ttti- ; both awnless or at most minutely mucro- 
nate, glabrous or pubescent, rarely shortly 
villous 
76. TB^OHO feE Trsr./ 
1C 
77. X - yoen - fo Ksrx: 
for 
Upper glume 7-, barren valve 5-nerved ; nerves con- 
spicuous, not anastomosing below the acute tips ; 0 
barren valve usually finely awned 78. Melinis. \ ' ^ 
d. Cenchastrae. 
Involucre spurious, formed by the indurated lower 
glumes of the spikelets of each group or cluster ; 
clusters spicate ... ... ... ... ... 79. Anthephora. 
Involucre not spurious, that is, not formed by parts of 
the spikelets. 
Involucre formed by highly modified bristle- or spine- 
like barren branchlets. 
Involucre of free naked or plumose bristles . . . 80. Pennisetum. 
Involucre of spines or rigid bristles united at the 
base into a hard cup ... ... 81. Cenchrus. JO JV 
Involucre of spurious bracts 82. Odontelytrum. 
Only African genus 
e. Trachydastrae. 
... 83. Phyllorrhachis. 
f. Isachnastrae. 
Florets very similar ; spikelets more or less panicled. . . 84. Isachne. [ 
Florets heteromorphous, both fertile ; spikelets in 
short secund spikes with a pungent rhachis, dis- 
tant along a common axis ... ... ... ... 85. Heteranth<ecia. 
Subfamily II. Pooideje. — Mature spikelets breaking up, leaving the per- 
sistent or subpersistent glumes on the pedicel, or if falling entire, then not con- 
sisting of 2 heteromorphous florets as in Panicoidece. 
A. Blades never transversely veined in the tropical African species (except 
in Centotheca and sometimes in Arundo), nor articulated on the sheath (86- 
172). 
a. Awn of the fertile floret if present, A kneed and twisted below the knee, or 
straight in reduced forms (86-113). 
i. Florets 2 or more (86-98). 
Tribe IY. ARUNDINELLEJE. — Florets 2, heteromorphous , the lower awnless 
or barren . Rhachilla not continued beyond the upper floret. Lower valve 
awnless, rather resembling the glumes ; upper generally ( always in the 
