734 



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



Figure 1635.— Distribution of 

 Andropogon furcatns. 



% (A. provincialis Lam.? not Retz.) — Dry soil, prairies, and open 

 woods, Quebec and Maine to Saskatchewan and Montana, south to 

 Florida, Wyoming, Utah, and Arizona ; Mexico (fig. 1635). An impor- 

 tant forage grass in the prairie States of the Mississippi Valley. 



12. Andropogon hallii Hack. Turkeyfoot. (Fig. 1636.) Re- 

 sembling A. furcatus, but with creeping rhizomes; racemes conspic- 

 uously villous, the hairs 

 grayish to pale golden; awn 

 of sessile spikelet rarely 

 more than 5 mm long, 

 often obsolete. % — 

 Sandhills and sandy soil, 

 North Dakota and eastern 

 Montana to Texas, Wyo- 

 ming, Utah, and Ari- 

 zona; Iowa (fig. 1637). 

 Intergrades with A. 

 furcatus . A form with 

 yellow-villous racemes 

 and awns 5 to 10 mm 

 long has been segre- 

 gated as A. chrysoco- 

 mus Nash. 



13. Andropogon 

 mohrii Hack. (Fig. 

 1638.) Culms stout, 

 compressed, tufted, 

 erect, 80 to 130 cm 

 tall, the upper half 

 sparingly to rather 

 freely branching; 

 leaves villous, the 

 lower sheaths 

 strongly keeled and 

 glabrous at base, the 

 blades elongate, 3 to 

 5 mm wide; inflo- 

 rescence narrow, the 



branches approximate, the ultimate branch- 

 lets short, densely bearded at summit, the purplish spathes 4 to 6 cm 

 long; racemes mostly 4, tawny, 2 to 4 cm long, on peduncles mostly 

 about 2 cm long, or the terminal ones sometimes long-exserted ; rachis 

 scarcely flexuous, the joints shorter than the spikelets, copiously 

 long- villous ; sessile spikelet 4 to 5 mm long, the awn loosely twisted 

 below, 1.5 to 2 cm long; pedicel long- villous, the spikelet reduced to a 

 minute glume. % — Wet pine woods and sandy seacoast, North 

 Carolina to Georgia and Louisiana (fig. 1639). 



14. Andropogon cabanisii Hack. (Fig. 1640.) Culms in small 

 tufts, erect, 80 to 150 cm tall, the upper half bearing long slender 

 branches; sheaths villous to nearly glabrous; blades 2 to 3 mm wide; 

 inflorescence loose; racemes 2, pale grayish-tawny, with about 15 

 joints, 4 to 7 cm long on slender long-exserted peduncles, the spathes 



Figure 1636.— Andropogon 

 hallii, X 1. (Hitchcock 

 584, Kans.) 



Figure 1638.— Andropogon mohrii, X 

 (Mohr, Ala.) 



Figure 1637— Distribution of 

 Andropogon hallii. 



