MANUAL OF THE GRASSES OF THE UNITED STATES 



701 



sparsely villous; bristles 1 

 spikelets about 2 mm 

 long; fruit rugose. Ql — 

 Open or rocky woods, 

 Texas and Arizona. Dif- 

 fering from S. macrosta- 

 chya in the looser panicle 

 and the longer lower 

 branches. 



8. Setaria corrugata 

 (Ell.) Schult. (Fig. 1573.) 

 Annual, erect or genicu- 

 late-spreading ; culms 

 freely branching, as much 

 as 1 m tall; blades flat, 

 scabrous, as much as 30 

 cm long and 1 cm wide 

 (commonly less than 5 

 mm); panicle dense, cyl- 

 indric, usually 5 to 10 cm 

 long, the axis densely 

 liispid-scabrous and also 

 villous; bristles much ex- 

 ceeding the spikelets, 

 sometimes as much as 2 

 cm long, green or purple; 

 spikelets 2 mm long ; fruit 

 coarsely rugose, o — 

 Sandy woods, cultivated 



to 1.5 cm long, rather numerous, flexuous; 



Figure 1570. — Setaria macrostachya, X 1. 

 (Hitchcock 13605, Tex.) 



Figure 1569. — Setaria viltosissima, X 1. (Smith, Tex.) 



fields, and waste places, along the 

 coast, North Carolina to Florida 

 and Louisiana; Cuba (fig. 1574). 



9. Setaria liebmanni Fourn. 

 (Fig. 1575.) Annual, branching 

 below, 30 to 100 cm tall; blades 

 flat, rather thin, 10 to 20 cm long, 

 1 to 2 cm wide, scabrous; panicle 

 loosely flowered, tapering at each 

 end, often nodding, usually 10 

 to 25 cm long, from slender to 

 25 mm wide; bristles 7 to 15 

 mm long; spikelets about 2 mm 

 long; fruit coarsely and strongly 

 rugose, o — Open sandy or 

 rocky soil, Arizona (Tucson) ; Mex- 

 ico to Nicaragua. 



10. Setaria grisebachii Fourn. 

 Grisebach bristlegrass. (Fig. 

 1576.) Resembling S. liebmanni; 

 blades smaller, panicle branches 

 densely flowered; fruit finely 

 rugose. o — Open ground, 

 often a weed in fields, Texas to 



Arizona; Mexico, 



