DESCRIPTIONS OF TRIBES AND GENERA. 



bb 



taneum L., the vast floating grass-bars which frequently 

 make navigation impossible. 



4. Sub-tkibe Ischaemeae. 



23. (90) Thelepogon Roth (BMniachne Hochst.). Ra- 

 cemes digitate. Rachis flexuose, joints notched. First 

 empty glume tuberculate. Flowering glume strongly 

 awned from the notch. 



Species one (Th. degans Roth), in India and Abyssinia. 



24. (91) Ischaemum L. (Fig. 16). Racemes two to 

 many, digitate, rarely solitary. Spikelets broad, the 

 pedicellate like the sessile, but frequently unawned, 



Fig. 16.— Ischcemum Urvilleanum Kuuth. (After Mart, et Eichl., " Flora Bras," II, 



III, 72.) 



rarely $ or empty. First empty glume coriaceous or 

 membranaceous, obtuse, often two-toothed. Flowering 

 glume awned from the apex or a notch. Mostly low 

 grasses with rather broad leaves. 



Species thirty-four, chiefly in Southern Asia and 

 Australia, very few in America and Africa. 



Sec. I. Meoschium (Beauv. as a genus, Colladoa Cav., 

 Ischremopogon Griseb.). Racemes two to many. 



Sec. II. Sehima (Forsk. as a genus) (Hologamium 

 Nees). Racemes solitary. 



25. (89) Eremochloa Biise non Watson (Pectinaria 

 Benth. as a section). Racemes solitary, densely flow- 

 ered, unilateral. Spikelets broad, awnless. Delicate, 

 ornamental grasses. 



