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



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); Mexico to 

 Nicaragua. 



10. Setaria grisebachii Fourn. 

 Grisebach bristlegrass. (Fig. 1103.) 

 Resembling S. liebmanni; blades 

 smaller, panicle branches densely 

 flowered; fruit finely rugose. O — 

 Open ground, often a weed in fields, 

 Texas to Arizona; Mexico. 



11. Setaria magna Griseb. Giant 

 bristlegrass. (Fig. 1104.) Annual, 

 robust, erect ; culms sparingly branch- 

 ing, as much as 4 m. tall and 2 cm. 



Figure 1102. — Setaria liebmanni, X 1. (Palmer 52, 

 Mex.) 



Figure 1103. — Setaria grisebachii, 

 1262, N. Mex.) 



X 1. (Metcalf 



Figure 1104. — Setaria magna, X 1. (Nash 1279, Fla.) 



thick at base; blades flat, scabrous, 

 as much as 50 cm. long and 3.5 cm. 

 wide; panicles densely flowered, nod- 

 ding, often interrupted at base, 

 tapering at each end, as much as 50 

 cm. long and 3 cm. thick, those of 

 the branches much smaller; bristles 

 1 to 2 cm. long; spikelets about 2 

 mm. long; fruit smooth or nearly so, 

 brown and shining at maturity. O 

 — Marshes and wet places along the 

 coast, New Jersey to Florida; Ar- 

 kansas and Texas; West Indies. 



12. Setaria viridis (L.) Beauv. 

 Green bristlegrass. (Fig. 1105.) 



