MANUAL OF THE GRASSES OF THE UNITED STATES 



435 



Figure 917.— Distribution of 

 Stipa scribneri. 



Figure 918.— Stipa 

 lemmoni. Floret, 

 X 1; lemma, X 5. 

 (Butler 830, Calif.) 



narrow-fusiform, villous with white hairs, those at the summit about 

 2 mm long, forming a brushlike tip; awn 14 to 20 mm long, twice- 

 geniculate. 91 — Mesas and rocky slopes, Colorado, 

 Utah, New Mexico, and Arizona (fig. 917). 



24. Stipa lemmoni (Vasey) Scribn. Lemmon nee- 

 dlegrass. (Fig. 918.) Culms 30 to 80 cm tall, sca- 

 berulous, usually puberulent be- 

 low the nodes; ligule 1 to 3 mm 

 long; blades 10 to 20 cm long, 

 flat or involute, 1 to 2 mm wide, 

 or those of the innovations very 

 narrow; panicle 5 to 12 cm long, 

 narrow, pale or purplish ; glumes 

 8 to 10 mm long, rather 

 broad and firm, somewhat ab- 

 ruptly acuminate, the first 5-nerved, the second 

 3-nerved ; lemma 6 to 7 mm long, pale or light brown, 

 the callus rather blunt, the body fusiform, 1.2 mm 

 wide, villous with appressed hairs; awn 20 to 35 mm 

 long, twice-geniculate, appressed-pubescent to the 

 second bend. % —Dry open ground and open 

 woods British Columbia to Idaho and California 



(fig. 919). 



25. Stipa viridula Trin. 

 Green needlegrass. (Fig. 

 920.) Culms 60 to 100 cm tall; 

 sheaths villous at the throat, 

 often rather sparingly so, more 

 or less hispidulous in a line across 

 the collar; ligule about 1 mm 

 long; blades 10 to 30 cm long, 



1 to 3 or even 5 mm wide, flat or, especially on the 

 innovations, involute; panicle 10 to 20 cm long, 

 narrow, rather closely flowered, greenish or tawny 

 at maturity; glumes 7 to 10 mm long, hyaline-attenuate; lemma 5 to 

 6 mm long, fusiform, at maturity plump, more than 1 mm wide, the 

 body at maturity brownish, appressed-pubes- 

 cent, the callus rather blunt; awn 2 to 3 cm 

 long, twice-geniculate. % — Plains and dry 

 slopes, New York (Cobbs Hill, Rochester), Wis- 

 consin to Alberta, south 

 to Kansas and New Mexico 

 (fig. 921). 



26. Stipa robusta Scribn. 

 Sleepy grass. (Fig. 922.) 

 Culms robust, mostly 1 

 to 1.5 m tall; sheaths 

 villous at the throat and 

 on the margin, a strong 



hispidulous line across the collar; ligul'e 2 to 4 

 mm long; blades elongate, flat or on the innova- 

 tions involute, those of the culm as much as 

 8 mm wide; panicle narrow, compact, often 

 more or less interrupted below, as much as 30 cm long and 2 cm 

 thick; glumes about 1 cm long, attenuate into a fine soft point; 



Figure 919.— Distribution of 

 Stipa lemmoni. 



Figure 920.— Stipa 

 viridula. Floret, 

 X 1; lemma and 

 summit, of sheath, 

 X 5. (Griffiths 

 201, S.Dak.) 



Figure 921.— Distribution of 

 Stipa viridvla. 



Figure 922.— Stipa robusta. 

 Panicle, X M; lemma, X 5. 

 (Hitchcock 13280, N.Mex.) 



