<98 l6. CRAMINEAF. 



154. Spikelets 2-flowcred without a continuation of the axis beyond the upper 



flower. Flowering glumes usually unawned 155 



Spikelets 2-flowered with a continuation of the axis beyond the upper 



flower, or 3— many-flowered. Flowering glumes awned. . 161 



153. Spikelets solitary, enveloped by a spathe. Flowering glumes connate. 



Style I, undivided. Stigma papillose. (See 3.) . . . Lygeum L. 



Spikelets in panicles, racemes, or spikes. Flowering glumes free. Styles 



2, free. Stigmas feathery 156 



136. Outer glumes with a cartilaginous, pectinately-toothed keel. Panicle 



spike-like. (See 112.) Prionachne Nees 



Outer glumes membranous 137 



137. Outer glumes liemispherical. Panicle spike-hke. — Species i. North- 



west Africa (Algeria) Airopsis Des v. 



Outer glumes not hemispherical. Panicle spreading 158 



138. Outer glumes shorter than the flowering glumes. Flowering glumes 



truncate or minutely toothed. — Species i. North-west Africa. (Under 



Aim L.) Molineria Pari. 



Outer glumes somewhat longer than the flowering glumes. . . . 139 



159. F'lowering glumes blunt, unarmed, hardened at maturity. Axis of the 



spikelet very short. (See 21.) Isachne R. Br. 



Flowering glumes 3-lobed, 2-toothed,or mucronate, usually provided with 

 a dorsal awn, not hardened at maturity 160 



160. Flowering glumes 3-lobed, unarmed. Axis of the spikelet somewhat 



elongated between the flowers. — -Species i. North-west Africa (Algeria). 

 Used as an ornamental grass. (Under .4 mr L.) . . Antinoria Pari. 

 Flowering glumes 2-toothed or mucronate, nearly always with a dorsal 

 awn. Axis of the spikelet very short. — Species 8. Extra-tropical 

 regions and mountains of the tropics. Some species are used as orna- 

 mental grasses Aira L. 



161. (134.) Flowering glumes with a terminal awn inserted between the apical 



lobes or teeth 162 



Flowering glume with a dorsal awn inserted below the apex. . . . 168 



162. Spikelets 2-flowered ; the lovvcr flower male, the upper female or herma- 



phrodite 163 



Spikelets 2- or more flowered ; all flowers hcrmaphrodiie or the uppermost 

 male. Flowering glumes 3 — 11 -nerved 165 



163. Spikelets in clusters of 3 at the tips ol the branches of a raceme or panicle. 



— Species 13. Tropical and South .Africa. . . Tristachya Nees 

 Spikelets solitary at the tips of the branches of a panicle 164 



164. Palea auricled. Flowering glume of the upper flower not distinctly 



toothed. Spikelets small. — Species 4. Tropical and South Africa. 



Some are used for piaiting-work Arundinella Raddi 



Palea not auricled. Flowering glume of the uppei flov/er distinctly 

 toothed. Spikelets large. — Species 23. Tropical and South Africa. 



Trichopteryx Nees 



