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



scabrous, the second segment about 2.5 cm long. Ql — Deserts, 

 canyons, and rocky hills, Colorado to southern California; southern 

 South America (fig. 888). 



3. Stipa leucotricha Trin. and Rupr. Texas needlegrass. 

 (Fig. 889.) Culms 30 to 60 cm tall, the nodes pubescent; blades 

 10 to 30 cm long, flat, often becoming involute, hispidulous beneath, 

 2 to 4 mm wide; panicle narrow, mostly not more than 10 cm long; 

 glumes 12 to 18 mm long; lemma about 1 cm long, the slender callus 

 about 4 mm long, the body oblong, brownish, appressed-pubescent 

 on the lower part, papillose-roughened at least toward the summit, 

 abruptly narrowed into a cylindric 

 smooth neck about 1 mm long, 

 the crown ciliate with short stiff 

 hairs; awn 6 to 10 cm long, rather 

 stout, twice-geniculate, the first 

 segment hispidulous, twisted, 2 to 



Figure 886.— Distribution of 

 Stipa neomexicana. 



Figure 885. — Stipa neomexicana. Piant, X Vi, 

 lemma, X 5. (Jones 5377, Utah.) 



Figure 887.— Stipa speciosa. Pan- 

 icle, X V-i, floret, X 5. (Reed 

 4853, Calif.) 



3.5 cm long. % — Dry, open grassland, Oklahoma to central 

 Mexico. Cleistogamous spikelets with glumes obsolete and lemma 

 nearly awnless are borne in basal sheaths just after maturity of 

 panicle. 



4. Stipa stillmanii Boland. (Fig. 890.) Culms stout, 60 to 100 cm 

 tall; sheaths smooth, puberulent at the throat and collar; ligule 

 very short; blades elongate, scattered, folded or involute, firm, the 

 uppermost filiform; panicle 10 to 20 cm long, narrow, dense or in- 

 terrupted at base, the branches short, fascicled; glumes equal, 14 to 

 16 mm long, papery, minutely scabrous, acuminate into a scabrous 



