102 1 6. GRAMINEAE 



Spikelets 2-flo\vcrcd, both flowers hermaphrodite or the lower flower 

 hermaphrodite, the upper one male or rudimentary, or 3 — many-flow- 

 ered 192 



192. Flowering glumes i — 3 -nerved. [Subtribes triodiinae and eragro- 



STiNAE.i 193 



Flowering glumes 5— many-nerved 207 



193. Flowering glumes 2 — 4-toothed or -cleft, rounded on the back, at least 



at the base 194 



Flowering glumes entire or obscurely toothed, rarely {Diplachne) distinctly 

 2-toothed and sometimes awned from the notch, but then keeled. 196 



194. Flowering glumes with 3 lather obtuse lobes. — Species i. North-west 



Africa Triodia R. Br. 



Flowering glumes with 2 acute lobes and an awn or mucro between 

 them 195 



195. Flowering glumes with a long awn, the upper ones empty. Outer glumes 



unequal. Spikes approximate, almost digitate. — Species i. South 



Africa. Lophacme Stapf 



Flowering? glumes with a short awn or a mucro. Outer glumes sub- 

 equai — Species 2. Central and South Africa. (Under Diplachne 

 Beauv.) Crossotropis Stapf 



196. Spikelets of two kinds, the fertile 2 — 3-flowered and surrounded by the 



sterile consisting of numerous two-ranked glumes, arranged in one- 

 sided spike-like panicles. Flowering glumes awned or mucronate. — 

 Species 8. North and South Africa. Some have edible seeds or are 

 used as fodder- or ornamental grasses. " Dogstail." Cynosurus L. 

 Spikelets all alike 197 



197. Spikelets in spike-like racemes, laterally flattened, falling as a whole, 



containing 3 — 4 fertile flowers and two empty glumes above them. — 



Species i. Abyssinia Harpachne Höchst. 



Spikelets in panicles ; empty glume above the fertile flowers i or none. 198 



198. Main branches of the panicles two-ranked, usually branched at their 



base 199 



Main brancnes of the panicles not two-ranked 203 



199. Panicles spreading, with long, thin branches. Spikelets 2 — 4-flowered, 



with membranous, unarmed glumes 200 



Panicles contracted (more or less spike-like) or with very short, rather 

 thick, but somewhat spreading branches 201 



200. Outer glumes slightly unequal. Perennial, creeping grasses, with flat 



leaves. — Species i. North Africa Catabrosa Beauv. 



Outer glumes very unequal the lower very small. Stalk of the spikelet 

 somewhat thickened. Delicate, annual grasses with narrow leaves. — 

 Species 2. North Africa Sphenopus Trin. 



201. Panicles with short, rather thick, more or less spreading branches. Glumes 



hard. Spikelets 3 — 13-flowered. — Species 5. Noith Africa. 



Cutandia Willk. 



