12 



Several of the species are valued as forage plants. 

 Cultivated oats, Avena sativa, is the best-known ex- 

 ample of this tribe. 



Holcus Linn., in part.* Trisetum Pers.* 



Aira Linn.* Avena Linn.* 



Weingaertneria Bernh.* Arrhenatheruin Beauv.* 



(Corynephorits Beauv.) Danthonia DC* 

 Deschampsia Beauv.' 



Tribe X. — Chloridece. 



Spikelets one- to several-flowered in one-sided spikes or racemes ; 

 these racemes digitate or fasciculate, rarely solitary: flowering 

 glumes usually keeled, entire and unawned, or toothed, and with 

 one or three straight awns. 



A small tribe of twenty-seven genera and one hun- 

 dred and fifty-five species, characterized chiefly by the 

 inflorescence, which is nearly that of Paspalum. The 

 awns when i^resent are not dorsal nor twisted, as in 

 Agrostidece and Avenece. Chiefly natives of tropical 

 and subtropical countries ; a few are widely distributed 

 as weeds throughout the warmer parts of the world. A 

 number are good turf-forming grasses, and are valued 

 for grazing purposes. One of these is the celebrated 

 buffalo-grass of the Western plains, which is remark- 

 able for having the staminate and pistillate spikelets 

 separate and in unlike inflorescences, either upon the 

 same plant (monoecious) or upon different plants (dice- 

 cious). 



Capriola Adans.* Schedounardu.s Steud.* 



(Cyrwdon 1'ersT) ' Bouteloua Lag.* 



Spartina Schreb.* Beckmannia Host." 



Campulosus Desv.* Eleusine Gaertn. 



(Ctenium Panzer). Dactyloctenium Willd.* 



Chloris Sw.* Leptochloa Beauv. * 



Trichloris Fourn.* Bulbilis Raf. 



Gynmopogon Beauv. * ( Buchloe Engelm.) 



