35 



slender, spreading-erect, the lower 2 to 3 em. long, few-flowered, much exceeding 

 their internodes; setae solitary, green, slender, somewhat flexuous, antrorsely 

 scabrous, 1.5 to 2.5 cm. in length. Spikelets lanceolate-ovate, acute, 2.5 to 3 mm. 

 long, pale green; first glume one-third as long as the spikelet, broadly ovate, 

 acute, 3-nerved, somewhat inclosing the base of the spikelet ; second glume nearly 

 equaling the flowering glume, ovate, acute, short apiculate, 5 to 7 nerved, 

 the midnerve excurrent, the lateral ones abruptly vanishing in the hyaline 

 margins or anastomosing; third glume equaling the flowering glume, 5-nerved, 

 apiculate, slightly sulcate and inclosing the flowering glume with its infolded 

 margins subtending a very 

 short lanceolate, hyaline 

 palea about one-fifth its own 

 length; flowering glume 

 lanceolate-ovate, acute, ab- 

 ruptly short-apiculate at the 

 incurved tip, rather finely 

 transversely undulate-ru- 

 gose below, striate and 

 punctate above, the inclosed 

 palea narrow, plane, simi- 

 lar in texture and markings. 



Type specimen collected by J. 

 G. Smith at San Diego, 

 Tex., May, 1897. Limpia 

 Canyon, Presidio Co., 115 

 (in part) Nealley 1892, a 

 smaller undeveloped speci- 

 men, with much less pubes- 

 cent leaves, otherwise as in 

 the type. 



A very distinct species, at once 

 distinguished from C. ma- 

 crostafhya (H. B. K.) Scribn. 

 and C. composita (H. B. K.) 

 Scribn. by its loose, open 

 panicle, larger spikelets, 

 and narrow pubescent 

 leaves, and from C. macro- 

 sperma by its more open 

 panicle and narrow pubes- 

 cent leaves. 



§ § Spikelets less than 3 mm. long. 



t Flowermg gluvu pitted or striate. 



25. Chaetochloa grisebachii 



(Fourn.) Scribn. IT. S. Dept. 

 Agr., Div. Agros. Bui. 4: 39 (1897) 

 Gram. 45 (1886) . (Fig. 20.) 

 A smooth, slender, ceespitose annual, 1.5 to 8 dm. high, with loose, compressed 

 sheaths, short, lanceolate leaves and loose, bristly, panicles 3 to 12 cm. long. 

 Culms branching at the base, very slender, glabrous, generally somewhat genic- 

 ulate below; nodes bearded with short appressed hairs; sheaths shorter than the 

 internodes, striate, open at the throat, scabrous, sparingly strigose-pubescent, 

 margins ciliate; ligule short, densely ciliate-f ringed; leaf -blades lanceolate, 

 slightly narrowed at the cordate base, acuminate, 5 to 10 cm. long, 5 to 10 mm. 



Fig. 20.— Chaetochloa grisebachii: a, b, c, views of the spikelet; 

 d, flowering glume, dorsal view. 



Setaria grisebachii Fourn. Mex. PI. Enum. 



