MANUAL OF THE GRASSES OF THE UNITED STATES 



361 



to 2 mm wide, scabrous; panicles narrow, 5 to 15 cm long, the branches 

 rather distant, ascending; spikelets 

 on short thick pedicels ; glumes broad, 

 obtuse, subequal, less than 1 mm 

 long; lemma narrow, 3 to 4 mm long, 

 scabrous, the slender awn 1 to 3 

 cm long. Q Open dry ground, 

 Arizona and southern California to 

 Peru. Cleistogamous spikelets are 

 developed at the base of lower sheaths, 

 solitary or few in a fascicle in each 

 axil, each spikelet included in an in- 

 durate thickened, tightly rolled nar- 

 rowly conical reduced sheath, which 

 readily disarticulates from the plant 

 at maturity. The glumes are wanting 

 and awn of lemma reduced, but the 

 grain is larger than that of the spike- 

 lets in the terminal inflorescence, being 

 about the same length (2 mm) but 

 much thicker. 



3. Muhlenbergia depauperata 

 Scribn. (Fig. 734.) Annual; culms 

 in dense tufts, 5 to 10 or rarely 15 

 cm tall, erect; blades scabrous, pubes- 

 cent on the upper surface, mostly less 

 than 3 cm long, about 1 mm wide; 



panicle narrow, loosely Spikelike, FIGURE ni-Muhlenbergla texana. 



usually more than half the entire 



length of the plant, the branches ap- 



pressed; glumes narrow, scabrous, the first irregularly bidentate or 



entire, mostly 1 to 2 mm long, 

 occasionally reduced, the second, 

 a little longer; lemma narrow, 

 terete, prominently 3-nerved, 

 slightly pubescent along the inter- 

 nerves, about 4 mm long, the 

 delicate awn straight, about 1 cm 

 long, o Open gravelly places, 

 Colorado, New Mexico, and Ari- 

 zona; Mexico. 



4. Muhlenbergia filiformis 

 (Thurb.) Rydb. PULL-UP MUHLY. 

 (Fig. 735.) Annual, tufted, rather 

 soft and lax, erect or somewhat 

 spreading; culms filiform, usually 

 5 to 15 cm tall, sometimes as much 

 as 30 cm;ligule about 2 mm long, 

 blades flat, usually less than 3 cm 

 long; panicle narrow, interrupted, 

 few-flowered, usually less than 5 cm 



FIGURE W.-Muhlenbergia mic-osperma. Plant, X lng; glumes OVate, 1 mm long; 



i; glumes and floret, x io. (Meams 2780, Ariz.) lemma lanceolate, acute, mucron- 

 ate, 2 mm long, minutely pubescent, scaberulous at tip. Open 



Plant, X 

 (Pringle 399, 



