130 



THE TRUE GRASSES. 



175. (174) Chloris Sw. (Fig. 69). Empty glumes nar- 

 row, very acute ; flowering glumes broader, usually two- 



Fio. 68.-Cteniwn Americanum 

 Schrank. (After A. Gray, 

 Man. pi. 9.) 



FIG. 69. Chloris barbata Sw. 

 O, Sterile glume. (After 

 Trin., Spec. Gram. pi. 306.) 



cleft, frequently ciliate ; one to several empty glumes 

 above, which are usually broadly truncate and often 

 awned. 



Species about forty, in all warm countries, except 

 Europe. Elegant grasses, some of which (Ch. gradlis 

 Dur. for example) are cultivated as ornamental plants. 

 The species with awnless flowering glumes compose the 

 section Eustachys Desv. (as a genus), Schultesia Spreng. 



176. (176) Trichloris Fournier. Spikes erect, rather 

 slender, approximate, or in elongated panicles, clothed 

 with the numerous delicate awns. Spikelets sometimes 

 2-3-flowered ; sterile bracts reduced to awns. 



Species two, in Mexico, Texas, Arizona ; two in Chili 

 and one in Argentine Republic. That in the latter 

 country (Tr.Blanchardiana Hack.) is as yet undescribed, 

 but has long been known to gardeners as CJdoropsis or 

 Chloridopsis Blanckardiana, and is prized as an ornamental 

 grass ; the one in Arizona is perhaps identical with it. 



