104 



Genera: 1. Elionurus ; 2. Hemarthria; 3. Rottboillia ; 4. 

 Manisuris. 

 Group 2. — Spikelets in pairs or threes, one sessile and fertile, and 

 one or two pedicelled, male, empty or defective, arranged 

 in spikes, spicate racemes, or open racemes, the flowering 

 glnme of the fertile flower commonly awned. 

 § 1. Panicle strict or dense. 

 Genera : 1. Imperata ; 2. Erianthus. 

 § 2. Panicle open and loose. 

 Genera: Andropogon ; Chrysopogon ; Sorghum. 



§ 3. Flowers in a close spike. 

 Genera: 1. Heteropogon ; 2. Trachypogon ; 3. Ischseinum. 



Series 2. — Poacese. 



Spikelets usually not articulated with the pedicel below the glumes ; 

 the rhachis continuous above the persistent lower glumes, and dis- 

 articulating with the flowers or persisting. The spikelets consist 

 rarely of a single flower, or of one perfect and one or two inferior 

 imperfect ones, or of from two to many flowers with the upper ones 

 or some of them imperfect ; the rhachis sometimes produced beyond 

 the upper flower as a stipe-like pedicel or as an imperfect flower. 

 The lower glumes are rarely depauperate or wanting. 



Tribe 1.— PHALARLDE.E. 



Spikelets with one perfect terminal flower only, or with the addi- 

 tion of 2 male or imperfect ones, or with one or two sterile pedicels, 

 below the perfect flower, and above the lower pair of glumes. Rha- 

 chilla not prolonged beyond the fertile flower. Perfect flower with- 

 out a two-nerved palet. 



Group 1. — Rhachis articulated below the spikelet. Flowers with 3 

 glumes and no palet. 



Genus: 1. Alopecurus. 

 Group 2. — Rhachis articulated above the lower glumes. 



Genera : 1. Phalaris ; 2. Anthoxanthum ; 3. Hierochloa. 



Tribe 2.— AGROSTIDE.E. 



Spikelet perfect, one-flowered ; rhachis often prolonged beyond the 

 flower into a bristle or stipe. 



