Flowering glumes slightly shorter or longer than the outer ones. 216 216. Flowering glumes cordate at the base, very concave, scarious, 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. Flowering glumes distinctly keeled. 218 Flowering 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. 219 219. Flowering glumes cartilaginous at the base, herbaceous towards the tip. Outer glumes unequal. Axis of the spikelet thickened. Panicles one-sided.--Species 1. North-west Africa (Algeria). =Sclerochloa= Beauv. Flowering glumes membranous or herbaceous at the base or throughout.--Species 20. Extra-tropical regions and mountains of the tropics. Some are used as ornamental grasses. =Poa= L. 220. Spikelets 2-flowered with very approximate flowers and a bristle-like continuation of the axis beyond them. Outer glumes rather stiff, 1-3-nerved. Flowering glumes somewhat shorter, blunt, awnless.--Species 10. South and East Africa. =Achneria= Munro Spikelets 2-flowered, with perceptibly distant flowers and usually membranous outer glumes, or 3-many-flowered. 221 221. Outer glumes 7-11-nerved, membranous. Flowering glumes toothed, usually awnless. Paleas narrow, 2-toothed. Spikelets usually 2-flowered. Fruit deeply furrowed. (See 152.) =Avena= L. Outer glumes 1-5-nerved, rarely 7-9-nerved, and then flowering glumes awned and paleas broad. Spikelets usually 3-many-flowered. 222 222. Flowering glumes 2-cleft, awned, 7-9-nerved. (See 167.) =Danthonia= DC. Flowering glumes entire, rarely toothed or 2-cleft, but then unarmed or 5-nerved. Styles very short. 223 223. Side-nerves of the flowering glumes nearly parallel, not joining the middle-nerve, sometimes obscure. Flowering glumes unarmed. Fruit oblong or ovate. 224 Side-nerves of the flowering glumes curved, converging towards the middle-nerve. Fruit oblong or linear. 225 224. Lodicules united. Styles distinctly developed. Fruit free, narrowly or not grooved.--Species 1 (_G. fluitans_ R. Br., manna-grass). North-west Africa. The seeds are used as food. (Under _Poa_ L.) =Glyceria= R. Br. Lodicules free. Styles wanting. Fruit usually adherent to the palea, broadly or not grooved.--Species 4. North-west and South Africa. (Under _Glyceria_ R. Br.) =Atropis= Rupr. 225. Paleas with rigidly ciliate keels. Flowering glumes 7-9-nerved. Outer glumes 3-7-nerved, rather stiff. Spikelets in spike-like racemes.--Species 9. Extra-tropical regions and mountains of the tropics. Some species are used as ornamental grasses. =Brachypodium= Beauv.