7l'2 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Figure 1098. — Setaria villosissima, X 1. (Smith, Tex.) 



blades flat or folded, scabrous on the 

 upper surface, rarely pubescent on 

 both surfaces, 15 to 40 cm. long, 3 to 

 10 mm. wide; panicle spikelike, 10 to 

 25 cm. long, mostly 5 to 10 mm. 

 thick, somewhat tapering but not at- 

 tenuate, more or less interrupted or 

 lobed; bristles 10 to 15 mm. long; 

 spikelets 2 to 2.5 mm. long, very 

 turgid ; fruit rugose. % — Open dry 

 ground and dry woods, Texas to Col- 

 orado and Arizona; Mexico. Variable, 

 especially in the thickness of the pan- 

 icle, sometimes very slender, occa- 

 sionally to 15 mm. thick. The type, 

 from Mexico, is the robust form with 

 thick panicles. 



Setaria setosa (Swartz) Beauv. 

 Panicle interrupted, attenuate at 

 apex. % — Ballast, Camden, N. 

 J., and Key West, Fla.; adventive 

 from the West Indies. 



Setaria rariflora Mikan ex Trin. 

 Similar to S. setosa, the panicle and 

 blades more slender. % — Mobile, 



Ala. ; adventive from South America. 



7. Setaria scheelei (Steud.) Hitchc. 

 (Fig. 1100.) Perennial, 60 to 120 cm. 

 tall; sheaths compressed-keeled, gla- 

 brous or more or less hispid, the collar 

 hispid; blades flat, elongate, as much 

 as 1.5 cm. wide, scabrous or more or 

 less pubescent; panicle rather loose, 

 mostly 15 to 20 cm. long, tapering 

 from near the base, the lower branches 

 as much as 3 cm. long, ascending, the 

 axis scabrous-pubescent and rather 

 sparsely villous; bristles 1 to 1.5 cm. 

 long, rather numerous, flexuous; 

 spikelets about 2 mm. long; fruit 

 rugose. % — Open or rocky woods, 

 Texas and Arizona. Differing from S. 

 macrostachya in the looser panicle and 

 the longer lower branches. 



8. Setaria corrugata (Ell.) Schult. 

 (Fig. 1101.) Annual, erect or genicu- 

 late-spreading; culms freely branch- 

 ing, as much as 1 m. tall; sheaths 

 scabrous to appressed-hirsute; blades 

 flat, scabrous, as much as 30 cm. 



