MANUAL OF THE GRASSES OF THE UNITED STATES 



729 



FIGURE 1624. Distribution of 

 Andropogon hirtiflorus. 



pubescence less copious. 21 Canyons and rocky slopes, western 



Texas to Arizona; Mexico. 



4. Andropogon semiberbis (Nees) Kunth. (Fig. 1625.) Culms 

 usually in rather small tufts, 60 to 120 cm tall, erect, 

 pinkish, compressed, the upper third to half freely branch- 

 ing; 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 hispid at base with erect hairs; 

 sessile spikelet about 6 mm long, the awn 10 to 15 mm 

 long ; pedicellate spikelet much reduced, short-awned, the 

 pedicel more or less ciliate on one 

 margin. 01 Pine woods, Flor- 

 ida; tropical America. 



5. Andropogon cirratus Hack. 

 TEXAS BEARDGRASS. (Fig. 1626.) 

 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 exserted, 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, 



FIGURE 1623 awnless, the pedicel stiffly ciliate on one side near the 

 M?tiflX?x summit. 91 Canyons and rocky slopes, western 

 i. (Chase Texas to Arizona and southern California (Jamacha): 



4193, Fla.) northem Mex i co . 



6. Andropogon scoparius 



Michx. PRAIRIE BEARDGRASS. 

 (Fig. 1627.) Plants green or glau- 

 cous, often purplish; culms tufted, 

 from slender to robust, com- 

 pressed, 50 to 150 cm tall, erect, 

 the upper half freely branching; 

 sheaths and blades commonly 

 glabrous or nearly so, frequently 

 sparsely pilose at their junction, 

 rarely pubescent to villous 

 throughout, the blades 3 to 6 mm 

 wide, flat; raceme 3 to 6 cm long, 

 mostly curved, the filiform pe- 

 duncles mostly wholly or partly 

 included in the sheaths, com- 

 monly spreading, the rachis 

 slender, flexuous, pilose, some- 

 times copiously so ; sessile spikelet 

 6 to 8 mm long, scabrous, the 

 awn 8 to 15 mm long; pedicellate 

 spikelet reduced, short-awned, 

 spreading, the pedicel pilose. 

 Qj. Prairies, open woods, dry 

 hills, and fields, Quebec and 

 Maine to Alberta and Idaho, 



south to Florida and Arizona (fig. 1628) . Also called little bluestem. 



A form with villous foliage has been segregated as A. scoparius var. 



FIGURE 1625. An- 

 dropogon semi- 

 berbis, XI. (C. 

 H. Baker 327, Fla.) 



FIGURE 1626.- 

 cirratus, X 1. 

 N. Mex.) 



Andropogon 

 (Greene 406, 



