104 ^^'- GRAMINEAE 



209. Spikelets 2-flo\vered, in pairs on the spike-like branches of a panicle. 



Outer glumes 3, the uppermost sometimes bearing a barren spikelet 



in its axil. (See 125.) Poecilostachys Hack. 



Spikelets many-flowered. Outer glumes 2. — Species 4. Tropics. 



Centotheca Desv. 



210. Spikelets in glomcrules arranged in panicles 211 



Spikelets not in glomerules 212 



211. Panicles one-sided. Outer glumes unequal, i — 3-nerved. Flowering 



glumes larger, firmer, 5-nerved, mucronate or awned, ciliate on the 

 keel. — Species i. North and South Africa. Used as a fodder- and 



ornamental grass. " Cocksfoot." Dactylis L. 



Panicles equal-sided. Outer glumes subequal, 5 — 7-nerved, usually hispid. 

 Flowering glumes shorter, thinner, 7^ — 9-nerved, unarmed. — Species 3. 

 South Africa Lasiochloa Kunth 



212. Spikelets tightly imbricate in short spikes arranged in racemes or heads. 



Flowering glumes broad, 7 — g-nerved, somewhat shorter than the 



palea, mucronate. — Species 4. North and East Africa. Aeluropus Trin. 



Spikelets tightly imbricate in solitary spikes or not imbricate. . . 213 



213. Spikelets very tightly imbricate, arranged in a linear false spike. Flowering 



glumes sharply keeled from the base, 7-nerved, unarmed. — Species 7. 

 North and South Africa and St. Helena. Used as ornamental plants. 



[Brizopynim Link) Desmazeria Dumort. 



Spikelets not very tightly imbricate ; if rather tightly, then flowering 

 glumes not keeled 214 



214. Styles inserted on the front of the ovary, conspicuously below the top. 



Flowering glumes usually awned. Fruit linear or oblong, adhering to 



■ the palea. (See 173.) Bromus L, 



Styles inserted on the top of the ovary or close to it 215 



215. Flowering glumes much shorter than the outer ones, 2-lobed or 2-cleft. 



Outer glumes with white, membranous margins. — Species 4. South 



and North Africa Schismus Beauv. 



Flowering glumes slightly shorter or longer than the outer ones. . . 216 



21^). Flowering glumes cordate at the base, very concave, scorious, broader than 



the outer glumes. Fruit strongly compressed. — Species 5. North 



Africa, Senegambia, and South Africa. Some are used as ornamental 



plants. " Quaking-grass." Briza L. 



Flowering glumes not cordate 217 



217. Mowering glumes distinctly keeled 218 



IHowering glumes rounded on the back, sometimes slightly keeled towards 



the tip 220 



218. Flowering glumes shortly awned, scarious. Panicles spike-like. (See 



151.) Koeleria Pers. 



Flowering glumes unawned, membranous herbaceous or cartilaginous. 

 Panicles usually spreading 219 



