103 



Fig. 77. Trichloris tasciculata Fourn. — a, b, The empty glumes of 2 spikelets; 

 c, a view of the first floret showing the rudimentary second floret; d, dorsal view 

 of the first floret which is terminated by 3 long awns. One other species of this 

 genus is illustrated by fig. 190 in Bui. 7*. 



77. TRICHLORIS Fourn. Mex. PI. 2: 142. 1881. Spikelets 1- to 3-flowered, 

 hermaphrodite, sessile in two series along the continuous rhachis of the unilat- 

 eral spikes; rachilla articulated above the empty glumes and prolonged above 

 the hermaphrodite flowers, terminating in an awned rudimentary floret. Lower 

 empty glumes 2, unequal, 1-nerved, thin-membranaceous, the 2d short-awned; 

 flowering glume membranaceous, 3-nerved, 3-awned; awns erect, subequal, or 

 the lateral ones much shorter. Palea closely enveloped by the glume, hyaline, 

 2-keeled. Stamens 3. Styles distinct; stigmas plumose. Grain narrow, oblong, 

 subterete, free within the glumes. Rather tall perennial (?) grasses with flat 

 leaves and many slender spikes, which are digitate or closely approximate at 

 the apex of the culm, forming dense oblong panicles. 



Species 2 or 3, Texas, Arizona, Mexico, and South America. 



