No. 35. 

 TRIODIA GRANDIFLORA Vasey. 



Flaid perennial, with tufted bulbous base, rather glaucous f)r minutely cinerous- 

 pubescent throughout. 



Cuhns slender, erect, not branching, often geniculate at the hairy nodes, terete, 

 sparingly piibescent, 1 to 2 feet tall. 



Leaves; radical, numerous with compressed, equitant, hairy-fringed sheaths 

 and flat or folded, white-margined, pubescent, obtuse or abruptly pointed blades, 

 2 to 4 inches long: of culm 3, rarely 2 or 4; sheaths half as long as internodo, 

 close, slightly pubescent or nearly glabrous; blades like those of radical leaves but 

 upper ones shorter and erect. 



Inflorescence a close, contracted, head-like white panicle, composed of numer- 

 ous, nearly sessile branches, 1 to 3 inches long; rachis and branches somewhat 

 pubescent, or scabrous. 



Spilcelets nearly sessile, oblauceolate, comin-essed, 4- to 6-flowered, 2 lines wide, 

 4 to 5 lines long; first glume lance-ovate, acute, carinate, membranaceous, minutely 

 scabrous on keel, 1-nerved or sometimes 3-nerved on lower spikelets, 2 to 3 lines 

 long; second glume same, but ciliate at base, always 1-nerved, and ] line longer; 

 floral glume lance-ovate, obtuse and minutely ciliate, or with 2 narrow lobes at 

 apex, jjubescent below, profusely ciliate, 3-nerved, 2 to 3 lines long; hisjiid mid- 

 nerve excurrent in an awn ^ to 1 line long; palet broadly lanceolate, pubescent at 

 the base and on the 2 prominent keels, 1 to 1| lines long. 



(Train not present in the specimens lexamiued. 



Plate XXXV: n :in<l b. floral glumes showing the extremes of variation at 

 the apices; c, jialet. 



This species has been called 7'. avenacea H. B. K., from which it differs in its 

 much larger size, and in its flowers, as is shown by a comparison of the figure in 

 H. B. K. 



Western Texas to Arizona and Mexico. 



