MANUAL OF THE GRASSES OF THE UNITED STATES 



759 



reduced, or but slightly so, awnless, 

 staminate. % — (A. provincialis 

 Lam. not Retz., A. furcatus Muhl.) — 

 Dry soil, prairies and open woods, 

 Quebec and Maine to Saskatchewan 

 and Montana, south to Florida, Wyo- 

 ming, Utah, and Arizona; Mexico. An 

 important forage grass in the prairie 

 States of the Mississippi Valley, and 

 a constituent of prairie hay. 



15. Andropogon hallii Hack. Sand 

 bluestem. (Fig. 1154.) Resembling 

 A. gerardi, but with creeping rhi- 

 zomes; racemes conspicuously villous, 

 the hairs grayish to pale golden; 

 awn of sessile spikelet rarely more 

 than 5 mm. long, often obsolete. % 

 — Sand hills and sandy soil, North 

 Dakota and eastern Montana to 

 Texas, Wyoming, Utah, and Arizona; 

 Iowa. Intergrades with A. gerardi. A 

 form with yellow-villous racemes and 

 awns 5 to 10 mm. long has been 

 segregated as A. chrysocomus Nash. 



16. Andropogon mohrii (Hack.) 

 Hack, ex Vasey. (Fig. 1155.) Culms 

 stout, compressed, tufted, erect, 80 

 to 130 cm. tall, the upper half 

 sparingly to rather freely branching; 

 leaves villous, the lower sheaths 



Figure 1155. — Andropogon mohrii, X 1. (Mohr, Ala.) 



strongly keeled and glabrous at base, 

 the blades elongate, 3 to 5 mm. wide; 

 inflorescence narrow, the branches 

 approximate, the ultimate branchlets 

 short, densely bearded at summit, 

 the purplish spathes 4 to 6 cm. long; 



Figure 1154. — Andropogon hallii, X 1. (Hitchcock Figure 1156. — Andropogon cabanisii, X 1. (Fredholm 

 584, Kans.) 6416, Fla.) 



