Figuee 1144. — Andropogon niveus, X 1. (Type.) 



MANUAL OF THE GRASSES OF THE UNITED STATES 



hispid at base with erect hairs; sessile 

 spikelet about 6 mm. long, the awn 

 10 to 15 mm. long; pedicellate spike- 

 let much reduced, short-awned, the 

 pedicel more or less ciliate on one 

 margin. % — Pine woods, Florida; 

 tropical America. 



5. Andropogon cirratus Hack. 

 Texas beardgrass. (Fig. 1143.) 

 Plants pale, glaucous to purplish; 

 culms slender, tufted, 30 to 70 cm. 

 tall, erect, the upper half sparingly 

 branching; blades flat, 1 to 4 mm. 

 wide, usually scabrous; raceme ex- 

 serted, 3 to 6 cm. long, the rachis 

 straight; sessile spikelet 8 to 9 mm. 

 long, the awn 5 to 10 mm. long; 

 pedicellate spikelet scarcely reduced, 

 awnless, the pedicel stiffly ciliate on 

 one side near the summit. % — 

 Canyons and rocky slopes, western 

 Texas to Arizona and southern Cali- 

 fornia (Jamacha); northern Mexico. 



6. Andropogon niveus Swallen. 

 (Fig. 1144.) Culms 50 to 65 cm. tall, 

 slender, erect in small tufts; sheaths 

 narrow, keeled, glabrous; blades 5 to 

 9 cm. long, 1 to 2 mm. wide, flat, 

 spreading or reflexed; raceme 3 to 4 

 cm. long, the rachis nearly straight 

 or somewhat flexuous, the joints very 

 densely villous; sessile spikelet 5 to 

 6 mm. long, the first glume glabrous, 

 obscurely bifid at the summit, 2- 

 nerved between the keels; awn about 

 1 cm. long, tightly twisted below the 

 bend; pedicellate spikelet 3 mm. 

 long, the pedicel densely villous. % 

 — Open sandy woods, central Florida. 



7. Andropogon sericatns Swallen. 

 (Fig. 1145.) Culms 50 to 80 cm. tall, 

 slender, tufted, erect, profusely 

 branching in the upper half; sheaths 

 keeled, glabrous, mostly shorter than 

 the internodes; blades of the inno- 

 vations subfiliform, 10 to 20 cm. 

 long, the culm blades broader, 2 to 3 

 mm. wide, folded; spathes very in- 

 conspicuous; peduncles filiform, 4 to 

 6 cm. long; raceme 3 cm. long, 

 scarcely exserted, the rachis flexuous, 

 conspicuously hairy; sessile spikelet 

 5 mm. long, the first glume prom- 

 inently 2-keeled, sulcate; awn 15 to 



753 



Figure 1145. — Andropogon sericatus, X 1. (Type.) 



20 mm. long, geniculate, tightly 

 twisted below the bend; pedicellate 

 spikelet 3 to 4 mm. long, including 

 the short awn. % — Ramrod Key, 

 Fla. 



8. Andropogon scoparius Michx. 

 Little bluestem. (Fig. 1146.) Plants 

 green or glaucous, often purplish, 

 culms tufted, from slender to robust, 

 compressed, 50 to 150 cm. tall, erect, 

 the upper half freely branching; 

 sheaths and blades commonly gla- 

 brous or nearly so, frequently sparse- 

 ly pilose at their junction, rarely 

 pubescent to villous throughout, the 



