54 THE TRUE GRASSES. 



flowered spikelets almost membranaceous, coriaceous 

 only upon the edges. 



Species one, in Khasya Mountains. 



Sub-genus VI. Phacelurus (Griseb. as a genus). False 

 spikes in simple racemes, sessile, rarely solitary. All 

 spikelets alike, two-flowered. 



Species three, in the Orient, Himalaya, and East Asia. 



19. (87) Manisuris Sw. Sessile spikelets one-flowered, 

 hollow-globose, pitted externally ; pedicellate spikelets 

 flat, S , or empty, their pedicels grown to the rachis. 



Species one (M. granulans Sw.), with leaves cordate 

 at the base. A weed in all tropical countries. 



20. Rhytachne Desv. Axis of the false spike articu- 

 late, easily separable at the joints whose ends are at right 

 angles to the axis and without appendages. First empty 

 glume of the sessile spikelets rugose and with one or 

 two terminal points or tails. Pedicellate spikelets rudi- 

 mentary, awned. 



Sub-genus I. Enrytachne. False spikes terminal and 

 solitary. 



Species two, in tropical Africa; one of them said to 

 occur upon the Antilles. 



Sub-genus II. Jardinea (Steud. as a genus). False 

 spikes, several, in a simple raceme, pedicellate. 



Species two, in tropical Africa. 



21. Urelytrum Hack. Axis of the false spike articu- 

 late, easily breaking into joints whose ends are oblique 

 and provided with an appendage at the upper end. 

 First empty glume of the sessile spikelets smooth, awn- 

 less. 



Species two, in tropical Africa to Natal. 



22. (89) Vossia Wall. & Griff. False spikes digitate, 

 stout, compressed. Rachis-joints curved, notched, not 

 excavated. First empty glume of the sessile spikelets 

 smooth, and like the pedicellate produced into a long 

 straight point or awn 1.5 to 2 cm. long. 



Species one ( V. procera Wall. & Griff.), a tall, aquatic 

 grass, frequently floating. In western India, and in tropi- 

 cal Africa, where it occurs in the swampy lands of the 

 Upper Nile, forming, in company with Saccharum span- 



