58 CLASSIFICATION 
ORYZEA, characters already given, comprises nine genera, 
mostly tropical or American, including Oryza sat¢va (cultivated 
rice) and Zizania aguatica. 
TRISTEGINE®. Spikelets solitary. (rarely paired or clustered) 
on the inarticulate branches of the panicle ; flowering glume thin, 
often hyaline, and frequently with a terminal bent awn, This 
4 a tribe of twelve genera, mostly tropical, the chief being 
Arundinella, 
ZOYSIEH. Spikelets scattered singly, or clustered along the 
inarticulate rachis or pedicels of the inflorescence ; fruiting spike- 
lets often falling off in little clusters; flowering glumes often 
smaller than the empty, and hyaline. A tribe of thirteen small 
genera, the typical one Zoysza. 
ANDROPOGONEA. Spikelets in pairs at each node of the 
jointed rachis or branches of the inflorescence, or terminal in 
triplets ; flowering glume much smaller than the lower or empty 
ones, hyaline, and often with a bent or twisted awn. Sometimes 
one of the spikelets of each pair is imperfect or rudimentary. 
This tribe comprises twenty-six genera, mostly tropical or sub- 
tropical, the largest Andropogon ; other large genera are Pollina, 
Ischamum, Chrysopogon, Rottbellia, This tribe includes also 
Saccharum (S. officinarum, the sugar cane) and Sorghum (S. 
vulgare, dourra). 
Series B. POACE, described in the preceding pages, is 
divided into seven tribes, viz. : 
PHALARIDE&, characters already given. Nine genera, Phalaris 
being the typical one, ZArharta the largest. 
AGROSTIDEA, characters already given. Thirty-eight genera, 
the largest Aristida, Stipa, Muehlenbergia, Sporobolus, Agrostis, 
Deyeuxta. 
AVENEA, characters already given, comprises twenty-two genera, 
Danthonia being by far the largest. Other leading genera are 
Trisetum, Avena, Eviachue, Deschampsia. 
CHLORIDE, characters already given, contains twenty-eight 
genera, mostly tropical or subtropical, the typical and largest one 
being Chloris. Includes Bouteloua and Eleusine. 
FESTUCE&, characters already given, is the largest tribe of all, 
comprising sixty-nine genera, the more important of which are 
Eragrostis, Poa, Festuca, Bromus, Glyceria, Melica, Triodia, 
Pappophorum. 
HORDEEA, characters already given, contains twelve genera, 
the more important of which are Hordeum (including the culti- 
vated barleys), Zrz¢écum (wheat and spelt), Secale (rye), and Agro- 
pyrum, differing technically from Zyz¢¢cum in the lateral nerves of 
the flowering glume not running parallel, but converging towards 
the tip. ; 
BAMBUSE&. Culms ligneous (woody) and commonly arbores- 
cent; leaves usually jointed to the sheaths; spikelets 1- or many- 
flowered, awnless ; lodicules three. This tribe comprises twenty- 
two genera, the leading ones Bambusa, Arundinaria and Chusquea. 
