No. IG. 



SPOROBOLUS ARGUTUS Ktli. {Vilfa Arhansana Trin. Vilfa arguia 



Nees. ) 



Plant animal, smooth tlii'oiighoiit except tlie scabrous margins of the leaves. 



Culm tufted, spreading, weak, branching below, smooth, to 13 inches tall. 



Leaves of radical shoots niimeroiis, with mostly smooth, loose, scarious sheaths 

 and flat blades 2 to 3 inches long; of culm 'I or ;J, lower sheaths mostly shorter 

 than internodes, close; blades like those of radical shoots, but upper ones much 

 shorter; ligiile a line of short tawny bristles. 



Inflorescence a rather narrow or sometimes spreading, erect panicle, 2 to 3 

 inches long, often included at base; branches 3 to 5 at base, alternate above, divided 

 and bearing many pedicellate spikelets on the outer two-thirds. 



Spikelets oblong-ovate, 1-flowered, | line long; first glume oblong, obtusish, 

 thin, hyaline, smooth, 1-nerved, J line long; floral glume lance-ovate, acute, thin, 

 1-nerved, | line long; palet broadly ovate, thin, obscurely 2-nerved, | line long. 



Orain elliptical, compressed, light-brown, with reddish scar, utricular, falling 

 free. 



Plate XVI; a, empty gliimes enlarged; b. floral glume and palet inclosing 

 grain. 



Texas to Arizona and Mexico. 



