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



Figure 913.— Stipa 

 lobata. Floret, X 

 1; lemma, X 5; 

 summit of lemma, 

 X 15. (Type.) 



Figure 914— Stipa 

 californica. Flo- 

 ret, X 1; lemma, 

 X 5. (Hall 2556, 

 Calif.) 



20. Stipa lobata Swallen. (Fig. 913.) 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 beneath; ligule less than 0.5 mm long; panicle 

 narrow, 10 to 18 cm long, the branches 

 appressed; glumes about equal, acumi- 

 nate, 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 twice-geniculate, 12 to 16 

 mm long, the first and second segments 

 appressed-hispid. % — Rocky hills at 

 medium altitudes, western Texas and 

 New Mexico. 



21. Stipa californica Merr. and Davy. 

 (Fig. 914.) Culms 75 to 125 cm tall; 

 ligule rather firm, 1 to 2 mm long; 

 blades 10 to 12 cm long, 1 to 4 mm 

 wide, flat, becoming involute, those of 

 the innovations slender and involute; 

 panicle 15 to 30 cm, sometimes to 50 cm, long, slender, 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 seg- 

 ments plumose. Ql — Dry 

 open ground, Washington 

 to California and western 

 Nevada (fig. 915). 



22. Stipa curvifolia Swal- 

 len. (Fig. 916, A.) Culms 

 densely tufted, erect, about 

 35 cm tall; leaves clustered 

 toward the base, the lower- 

 most sheaths pubescent, the blades involute, 

 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- 

 geniculate, 22 to 25 mm long, twisted and densely 

 plumose below the bend. % — Known only from 

 limestone cliffs, Guadelupe Mountains, N.Mex. 



23. Stipa scribneri Vasey. Scribner nee- 

 dlegrass. (Fig. 916, B.) Culms 30 to 70 cm 

 tail; 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 involute; panicle 10 to 25 cm long, 

 contracted, the rather short stiff branches erect; glumes 10 to 15 

 mm long, relatively firm, attenuate; lemma about 8 mm long, pale, 



Figure 915.— Distribution of 

 Stipa californica. 



Figure 916— .4, Stipa 

 curvifolia. Floret, X 1; 

 lemma, X 5. (Type.) 

 B, S. scribneri. Floret, 

 X 1; lemma, X 5. 

 (Vasey, N.Mex.) 



