GRAMINE.E. (GRASS FAMILY.) 539 



TBIBB EEL P AXICE.E. Spikelets 2-flowered ; the lower flower always imperfect, cither 

 staminate or neutral ; in the latter case usually reduced to a single empty valve (placed 

 next the lower glume, if that be present) ; the upper (terminal) flower (placed next the 

 upper or inner glume) only fertile. Embryo and groove (when present) on the outer 

 Bide of the grain ! (next the lower valve of the fertile flower). (Flowers polygamous, or 

 hemigamous (when the lower flower is neutral), or sometimes seemingly simple and per- 

 fect, from the suppression both of the lower glume and of the upper palea of the neutral ' 

 flower, sometimes monoecious, or rarely dioecious. Rarely both glumes are wanting.) 



Rubtribe 1. PASPALRE, Griseb. Glumes and sterile paleae herbaceous or membranaceous : 

 paleae of the fertile flower of firmer texture, coriaceous or chartaceous. awnless, not 

 keeled, more or less flattened parallel with the glumes. 



* Spikelets appearing as if simply 1-flowered from the suppression of the lower glume ; the sin- 



gle neutral palea of the sterile flower apparently occupying its place. (Awnless.) 



66. MILIUM. Spikelets not jointed with then- pedicels, all alike in a terminal open panicle. 



67. AMPHICARPUM. Spikelets jointed with their pedicels, of 2 sorts ; one in a terminal pan- 



icle ; the other subterranean, on radical peduncles 



68 P ASP ALUM. Spikelets jointed with their short pedicels, all alike, plano-convex, in one 

 sided spikes or spiked racemes. 



* # Spikelets manifestly 1^-2 flowered (polygamous, the lower flower staminate or often neu- 



tral), the lower glume being present 



69. PANICUM. Spikelets not involucrate, nor the peduncles bristle-bearing. Lower glume 

 small or minute. Sterile flower either staminate or neutral 



60. SET ARIA. Spikelets spiked-panicled, the peduncles continued into naked solitary bristles: 



otherwise as in Panicum. 



61. CENCHRUS. Spikelets enclosed 1-5 together in a hard and spiny globular bur-like invo- 



lucre. 



Subtribe 2. SACCHARIC. Fertile paleae membranaceous or searious, always of thinner and 

 more delicate texture than the (often indurated) glumes, frequently awned from the tip. 

 Spikelets usually in pairs or threes, panicled or spiked, some of them entirely sterile 

 (heterogamous). 



* Spikelets monoecious, imbedded in the separable joints of the spike. 



62. TRIPSACUM. Staminate Spikelets above, in pairs at each joint: pistillate single in each 



joint : glumes indurated. 



# Fertile spikelets with one perfect and one sterile (staminate or mostly neutral) flower : low- 

 er palea of the perfect flower awned. 



63. ERIANTHUS. Both spikelets at each joint of the rhachis alike fertile, involucrate with a 



silky tuft : otherwise as No 64. 



64. ANDROPOGON. Spikelets 2 at each joint of the plumose-hairy spikes, one of them sessile 



and fertile ; the other pedicelled and sterile or rudimentary. 



66. SORGHUM. Spikelets in open panicles, 2-3 together, the lateral ones sterile or sometimes 

 reduced to mere pedicels. 





 1. LEi; US I A, Solander. FALSE RICE. WHITE GRASS. 



Sjxikelets 1-flowered, perfect, flat, crowded in one-sided panicled spikes or 

 racemps, more or less imbricated over each other, jointed with the short pedicels. 

 Glumes wanting. Paleae chartaceous, much flattened laterally, boat-shaped, 

 awnless, bristly-ciliate on the keels, closed, nearly equal in length, but the lower 

 much broader, enclosing the flat grain. Stamens 1-6. Stigmas feathery, the 

 hairs branching. Perennial marsh grasses : the flat leavss, sheaths, &c., rough 

 upwards (especially in No. 1), being clothed with vcrv minute hooked prickles 

 (Named after Leers, a German botanist.) 



