MANUAL OF THE GRASSES OF THE UNITED STATES 



hairs 1 to 2 mm. long. % — Mesas 

 and rocky slopes, Idaho to Washing- 

 ton and central California. 



18. Stipa elmeri Piper and Brodie 

 ex Scribn. (Fig. 655.) Culms 60 to 

 100 cm. tall, more or less puberulent, 

 especially at the nodes ; sheaths pubes- 

 cent; ligule very short; blades 15 to 

 30 cm. long, 2 to 4 mm. wide, flat 

 or becoming involute, pubescent on 

 the upper surface, or those of the 

 innovations also on the lower sur- 

 face; panicle narrow, 15 to 35 cm. 

 long, rather loose; glumes 12 to 14 

 mm. long, long-acuminate, hyaline 

 except toward base; lemma about 7 

 mm. long, appressed-pubescent, the 



455 



Figube 656. — Stipa latiglumis. Floret, X 1; lemma, 

 X 5. (Type.) 



Figure 657. — Stipa occidentalis. 

 Panicle, X Yi\ lemma, X 5. 

 (Hitchcock 11740, Oreg.) 



lower as much as 10 cm. long; glumes 

 about equal, firm, rather abruptly 

 acute or acuminate, 3-nerved, tinged 

 with purple, 13 to 15 mm. long, 1.5 

 mm. wide from keel to margin; lem- 

 ma densely pubescent, 8 to 9 mm. 

 long, the sharp callus 1 mm. long; 

 awn twice-geniculate, 3.5 to 4.5 cm. 

 long, the first and second segments 

 plumose. % — Sierras of central 

 California at medium altitudes. 



20. Stipa occidentalis Thurb. 

 Western needlegrass. (Fig. 657.) 

 Culms mostly 25 to 40 cm. tall; 



callus 1 mm. long; awn 4 to 5 cm. 

 long, distinctly twice-geniculate, the 

 segments nearly equal, the first and 

 second finely plumose. % — Dry 

 hills, sandy plains, and open woods, 

 Washington and Idaho to California 

 and Nevada. 



19. Stipa latiglumis Swallen. (Fig. 

 656.) Culms slender, erect, strigose 

 below, 50 to 110 cm. tall; sheaths, 

 at least the lower, pubescent; blades 

 flat or loosely involute, pilose on the 

 upper surface, glabrous beneath; lig- 

 ule 1 to 4 mm. long; panicle narrow, 

 loosely flowered, 15 to 30 cm. long, 

 the branches distant, slender, the 



Figure 658. — Stipa lobata. Floret, X 1; lemma, X 5; 

 summit of lemma, X 15. (Type.) 



