170 THE TRUE GRASSES. 



are 'widespread. Trachynia Link is an annual species 

 with few spikelets. 



TRIBE XII. HORDEJE. 



Spikelets one- to many-flowered (if many, the upper- 

 most flower imperfect), sessile on teeth or notches of the 

 rachis, forming a spike. 



A. Stigma one, spike unilateral 272. Nardus. 



NOTE. Compare Streptogyne with 2-8 stigmas. 



B. Stigmas ttvo, spike symmetrical. 



a. Spikelets solitary at the notches of the rachis. 

 a. Spikelets in the median line of the rachis, that 

 is, the glumes having their backs turned to the 

 hollow surface of the rachis. 



I. Spikelets many-flowered. . 273. Lolium. 

 II. Spikelets two-flowered ; flowering glumes 



three-cleft 274. Kralikia. 



III. Spikelets with one lower $ flower, and one 

 upper $ flower ; flowering glumes awn- 

 less 275. Kerinozoma. 



IV. Spikelets one-flowered. 



1. Dioecious. Empty glumes grown to 

 the rachis for half their length. 



277. Jouvea. 



2. Hermaphrodite. Empty glumes free. 



* Empty glumes two, the lower 



shorter. Callus of flowering 



glume hairy. . 276. Oropetium. 



** Empty glume one. Callus naked. 



278. Monerma. 



**'* Empty glume one. Joints of the 

 rachilla with wing-like append- 

 ages 278a. Ischnurus. 



/?. Spikelets transverse, that is, the sides turned 

 toward the hollowed surface of the rachis. 

 I. Spikelets 1-2-flowered in a slender, articu- 

 late spike, each joint of which separates 

 with the adjoining spikelet at maturity. 

 1. Empty glumes two, exceeding the flow- 

 ering glumes. 



