MANUAL OF THE GRASSES OF THE UNITED STATES 



% — Known only from limestone 



cliffs, Guadalupe Mountains, N. Mex. 



24. Stipa scribneri Vasey. Scrib- 



NER NEEDLEGRASS. (Fig. 661.) Culms 



30 to 70 cm. tall; sheaths villous at 

 the throat; ligule less than 1 mm. 

 long; blades 15 to 25 cm. long, 2 to 

 4 mm. wide, flat or sometimes in- 

 volute; panicle 10 to 25 cm. long, con- 

 tracted, the rather short stiff branches 

 erect; glumes 10 to 15 mm. long, 

 relatively firm, attenuate; lemma 

 about 8 mm. long, pale, 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. % 

 — Mesas and rocky slopes, Colorado, 

 Utah, New Mexico, and Arizona. 



457 



Figure 662. — Stipa lemmoni. Floret, X 1 

 lemma, X 5. (Butler 830, Calif.) 



Figure 661. — Stipa scribneri. 

 Floret, X 1; lemma, X 5. 

 (Vasey, N. Mex.) 



25. Stipa lemmoni (Vasey) Scribn. 



LEMMON NEEDLEGRASS. (Fig. 662.) 



Culms 30 to 80 cm. tall, scaberulous, 

 usually puberulent below 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 abruptly 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 Col- 

 lumbia to Idaho and California. 



26. Stipa viridula Trin. Green 

 needlegrass. (Fig. 663.) 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, espe- 

 cially 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 ma- 

 turity plump, more than 1 mm. wide, 

 the body at maturity brownish, ap- 

 pressed-pubescent, the callus rather 

 blunt; awn 2 to 3 cm. long, twice- 

 geniculate. 91 — Plains and dry 

 slopes, Alberta and Saskatchewan to 

 Wisconsin and Illinois, west to Mon- 

 tana and Arizona; New York (near 

 Rochester); east of the Mississippi, 

 found near railways. 



Figure 663. — Stipa virid- 

 ula. Floret, X 1; lemma 

 and summit of sheath, X 

 5. (Griffiths 201, S. Dak.) 



