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



base often included in the somewhat 

 dilated sheath, the rachis joints, 

 pedicels, and first glume of sessile 

 spikelet pubescent, the rachis 

 straight; sessile spikelet about 6 mm. 

 long, the awn 10 to 15 mm. long; 

 pedicellate spikelets much reduced, 

 short-awned. % (A. oligostachyum 

 Chapm.) — Pine woods, southern 

 Georgia and Florida; tropical Amer- 

 ica. Andropogon hirtiflorus var. 

 thensis (Fourn.) Hack. Blades sca- 

 brous; sessile spikelet as much as 9 

 mm. long, the first glume minutely 

 papillose, the pubescence less copious. 

 % — Canyons and rocky slopes, 

 western Texas to Arizona; Mexico. 



Figure 1140. — Andropogon tener, X 1. (Rolf* 986, 

 Fla.) 



sessile spikelet about 4 mm. long, 

 the awn 7 to 10 mm. long; % — 

 Dry pine woods and prairies, Coastal 

 Plain, Georgia to Florida, Texas, 

 and Oklahoma; tropical America. 



3. Andropogon hirtiflorus (Nees) 

 Kunth. (Fig. 1141.) Culms tufted, 

 60 to 120 cm. tall, erect, reddish, the 

 upper half sparingly branching; foliage 

 often glaucous, the blades 2 to 4 mm. 

 wide; raceme 6 to 10 cm. long, the 



Figure 1141. — Andropogon hirtiflorus, X 1. (Chase 

 4193, Fla.) 



Figure 1142. — Andro- Figure 1143. — Andropogon 



pogon semiberbis, X 1. cirratus, X 1. (Greene 406, 



(C. H. Baker 327, N. Mex.) 

 Fla.) 



4. Andropogon semiberbis (Nees) 



Kunth. (Fig. 1142.) Culms usually 

 in rather small tufts, 60 to 120 cm. 

 tall, erect, pinkish, compressed, the 

 upper third to half freely branching; 

 blades 2 to 4 mm. wide, glabrous; 

 raceme 5 to 8 cm. long, the base 

 often included in the sheath, the 

 rachis straight, the joints short- 



