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



twice-geniculate, 12 to 16 mm. long, 

 the first and second segments ap- 

 pressed-kispid. 01 — Rocky hills at 

 medium altitudes, western Texas and 

 New Mexico. 



22. Stipa californica Merr. and 

 Dav}'. (Fig. 659.) Culms 75 to 125 

 cm. tall; ligule rather firm, 1 to 2 

 mm. long; blades 10 to 25 cm. long, 

 1 to 4 mm. wide, fiat, becoming in- 

 volute, those of the innovations slen- 

 der and involute; panicle 15 to 30 

 cm., sometimes to 50 cm., long, slen- 

 der, pale; glumes about 12 mm. long; 

 lemma 6 to 8 mm. long, rather 

 sparsely villous with ascending white 

 hairs, those at the summit about 1.5 

 mm. long; awn 2.5 to 3.5 cm. long, 

 twice-geniculate, the first and second 

 segments plumose. % — Dry open 

 ground, Idaho and Washington to 

 California and western Nevada. 



Figure 659. — Stipa californica. Floret, X 1; lemma, 

 X 5. (Hall 2556, Calif.) 



sheaths glabrous to pubescent; blades 

 10 to 20 cm. long, 1 to 2 mm. wide, 

 usually involute, glabrous beneath, 

 white-puberulent on the upper sur- 

 face; panicle 10 to 20 cm. long, lax, 

 the few slender branches narrowly 

 ascending; glumes about 12 mm. long, 

 the attenuate tips hyaline; lemma 

 pale brown, about 7 mm. long, rather 

 sparsely appressed-pubescent; awn 3 

 to 4 cm. long, twice-geniculate, plu- 

 mose, the hairs on first and second 

 segments about 1 mm. long, shorter 

 on third segment. 01 — Plains, 

 rocky hills, and open woods, Wyo- 

 ming to Washington, Arizona, and 

 California. 



21. Stipa loMta Swallen. (Fig. 

 658.) Culms densely tufted, erect, 

 scaberulous below the panicle, 35 to 

 85 cm. tall; blades flat or loosely 

 folded toward the base, tapering into 

 a fine point, as much as 50 cm. long, 

 1 to 4 mm. wide at the base, scabrous 

 on the upper surface, glabrous be- 

 neath; ligule less than 0.5 mm. long; 

 panicle narrow, 10 to 18 cm. long, 

 the branches appressed; glumes about 

 equal, acuminate, 3-nerved, scabrous, 

 9 to 10 mm. long; lemma brownish, 

 6 mm. long, densely pubescent with 

 hairs 1 to 2 mm. long, the callus 

 very short, blunt, the summit 2- 

 lobed, the lobes 0.8 to 1.5 mm. long, 

 awned from between the lobes; awn 



Figure 660. — Stipa curvi folia. Floret, X 1; lemma, 

 X 5. (Type.) 



23. Stipa curvifolia Swallen. (Fig. 

 660.) Culms densely tufted, erect, 

 about 35 cm. tall; leaves clustered 

 toward the base, the lowermost 

 sheaths pubescent, the blades in- 

 volute, becoming curved with age; 

 panicle 7 to 8 cm. long, dense, the 

 branches short, appressed; glumes 

 about 10 mm. long; lemma 5.5 mm. 

 long, light brown, evenly white pilose; 

 awn once or obscurely twice-genicu- 

 late, 22 to 25 mm. long, twisted and 

 densely plumose below the bend. 



