22 



the wet and previously plowed meadows. The local name there is 

 Zacate. It occurs in all tropical countries. 



2. L. lenticnlaris, Michx. White grass. Virginia, South and West. 



3. L. monandra, Sv:z. Florida. 



4. L. oryzoides, Sv:z. False rice. Massachusetts to Texas. 



5. L. Virginica, Willd. Cut-grass. Maine to Texas. 



The two latter species are common on marshy or moist ground. 

 They are sometimes cut for hay. 



Thcebekia, Benih. 



Panicle rather long and loose. Spikelets narrow, one-flowered, 

 and with an awn-like pedicel, outer glumes equal and coriaceous, the 

 flowering glame nearly as long, chartaceons, compressed, the apex 

 obliquely truncate and terminating in a long twisted awn ; palet 

 somewhat shorter and narrower, membranaceous ; stamens 3, styles 

 distinct. 



1. T. Arkausana, Benih. (Limnas, Steudel, Greenia, Nutt., Scle- 

 rachne, Torr.) Arkansas and Texas to Florida. 



Trinius made a second species, from Texas, (T. pilosa,) but it is 

 probably only a pubescent form of the first. Dr. Chapman says 

 "spikelets two flowered," which must be a mistake. 



Hilakia. H. B. K. 



Inflorescence in terminal spikes ; the spikelets in small clusters 

 of three, closely sessile at the joints of the rhachis, the central spike- 

 let containing a single fertile flower, either female or perfect ; the 

 two lateral spikelets each with two or three male flowers. The 

 spikelets are so closely sessile as to require much care to separate 

 them properly. The outer glumes of the spikelets are unlike, 

 mostly thin, rigid, and strongly nerved, some lobed or bifid, dentate 

 or lacerate at the apex, some awnless, and some awned between 

 the lobes. 



1. H. cenchroides, H. B. K., var. Texana. Texas and New Mexico. 



2. H. Jamesii, Benth. (Pleuraphis, Torr.) Texas and New Mexico. 



3. H. mutica, Benth. (Pleuraphis niutica, Buckl.) Texas and New 



Mexico. 



4. H. rigida. (Pleurapliis rigida, Thurber.) Arizona. 



The grasses of this genus are natives of the arid regions extend- 



