152 



TEE TllUE GRASSES. 



p. 261 (Eremochloe S. "Wats.). Low, branched grasses, 

 with crowded, involute leaves ; spikes few, in capitate 

 panicles ; flo waving glumes very hairy. 



Species two, upon the high western plateaux of North 

 America. 



219. (201) Triodia Brown. Panicle usually open ; 

 flowering glume rounded on the back (at least below), 

 coriaceous or chartaceous, often 

 hairy on the callus and margins. 

 Perennial grasses with narrow rigid 

 leaves and variable habit. 



Species twenty-six, throughout 

 the temperate zones, a few in tropi- 

 cal America. 



Sec. I. Isotria. Flowering glume 

 three-parted almost to the middle. 

 Tr. pungens Brown, and the related 

 Tr. MitchelU, Tr. Cunninghamii, and 

 Tr. irritans Brown, belonging to 

 the following Sec, are character- 

 ized by their rigid, involute, finely- 

 pointed, and often sticky leaves ; 

 they cover, often exclusively, large 

 areas of the deserts and elevated 

 plains of the interior of Australia, 

 and are known to the colonists and 

 to travellers as " Spinifex" (not to 

 Fl Beauv _ (After* Nees/'oen 8 be confounded with No. 76), and are 

 Germ -' L 51) very troublesome. 



Sec. II. Sieglingia Bernhardi (as a genus). Flower- 

 ing glume with three short, rather obtuse teeth. Triodia 

 decumbens Beauv. (Fig. 77) in Europe. 



Sec. III. Rhombolytrum Link (as a genus). Flower- 

 ing glume shortly two-toothed, sometimes entire. In 

 North and South America. (T. fliformis Nees, T. al- 

 bescens Munro, etc.) 



Sec. IV. Tricuspis Beauv. (as a genus), ( WiiuJsoria 

 Nutt., Tridens R. & S.). Flowering glume usually entire, 

 but with the three nerves extending into three short awns 



