12 



Several of the species are valued as forage plants. 

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

 ample of this tribe. 



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



AiraLinn.* Avena Linn.* 



Weingaertneria Bernh.* Arrheuatherum Beau v.* 



(Corynephorus 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 present 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 wanner 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 (dioe- 

 cious). 



Capriola Adans. Schedonnardua Steud." 



(Cynodon Pers.) Bouteloua Lag.* 



Spartina Schreb. Beckmannia Host.* 



Campulosus Desv.* Eleusine Gaertn.* 



i Ctenium Panzer). Dactyloctenium Willd.* 



Chloris Sw. Leptochloa Beauv.' 



Trichloris Fourn. ' Bulbilis Raf.* 



Gymnopogon Beauv.* ( Buchloe Engelm.) 



