61 



3. C. Floridana, (Enstaehys Floridana, Chap.) Florida. 



4. 0. glauca, (Eustachys glauca, Chap.) Florida. 



5. C. Swartziana, JDoell. (Chloris petrsea, Swz.) Florida to Texas. 



6. C. verticillata, Nutt. Texas. 



Tbichloris, Founder. 



Spikelets sessile in two rows on the rhachis of long spikes which, 

 are crowded, or in approximate verticils, near the apex of the culm ; 

 like Chloris the spikelets have one (the lower) perfect, and from 

 one to three imperfect flowers, the glumes of which are three awned 

 at the apex ; outer glumes unequal, acute or the upper aristate ; palet 

 of the fertile flower narrow, hyaline, two-nerved. 



1. T. pluriflora, Fourn. Texas to Arizona. 



2. T. verticillata, Fourn. Texas to Arizona. 



(tymnopogon, Beauv. 



Spikelets sessile and remotely alternate on. long and filiform 

 branches of the panicle, each with one, or rarely two perfect flowers- 

 and a bristle-like rudiment, or an awn-like pedicel ; outer glumes- 

 long lanceolate, as long as the spikelet, nearly equal,, keeled, acute ; 

 flowering glume cylindrical, involute, two-toothed or lobed at the 

 apex, and from the midrib a straight slender awn ; palet included in 

 its glume, narrow, two-keeled ; glume of the imperfect flowers also- 

 terminated with a long awn. 



1. G. brevifolius, Trin. Southern States, Delaware. 



2. G. racemosus, Beauv. New Jersey and southward to Texas. 



Schedonnardus, Steudel. 



Spikelets one-flowered, solitary at each joint of the slender trian- 

 gular rhachis of the paniculate spikes, and partly immersed in an 

 excavation ; the spikes alternate and distant ; outer glumes acumi- 

 nate, unequal, the longer equaling the flowering glume, which is 

 linear-acuminate, and thickish at the keel ; palet shorter and thinner. 

 1. S. Texanus, Steudel. (Lepturus pauiculatus, J$\M.) Illinois to. 

 Texas, northward to Colorado, Kansas, Montana. 



Bouteloua, Laq. 

 Spikes single, or numerous in a racemose,, commonly one-sided 



