MANUAL OF THE GRASSES OF THE UNITED STATES 



729 



Figure 1624— Distribution of 

 Andropogon Mrtiflorus. 



Figure 1623.— 

 Andropogon cmmU 

 hirtiflorus, X 

 1. 

 4193, 



pubescence less copious. % — 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. % — 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, 

 awnless, the pedicel stiffly ciliate on one side near the 

 % — Canyons and rocky slopes, western 

 (Chase Texas to Arizona and southern California (Jamacha); 

 northern Mexico. 



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. 

 21 — 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.— Andropogon 

 cirratus, XI. (Greene406. 

 N. Mex.) 



