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



cm long, involute, subfiliform, scabrous; panicle 10 to 20 cm long 



Figure 892.— Stipa richardsoni. Panicle, X Vi\ floret, X 1; lemma, X 5. (Hitchcock 11468, Alberta.) 



open, the branches slender, distant, spreading 

 below; glumes 8 to 9 mm long; lemma about 

 5 mm long, subfusiform, brown at maturity; 

 awn 2.5 to 3 cm long. % — Bottom lands 

 and wooded slopes, Saskatchewan to Colo- 

 rado and British Columbia 

 (fig. 893). 



7. Stipa avenacioides 

 Nash. (Fig. 894.) Culms 

 about 1 m tall; ligule 2 to 3 

 mm long; blades elongate, 

 involute, subfiliform; panicle 

 10 to 25 cm long, open, the 

 branches slender, spreading, 

 naked below; glumes about 

 2 cm long; lemma brown, 

 linear, 1.5 to 2 cm long in- 

 cluding the callus 7 mm 

 long, the body glabrous, mi- 

 nutely papillose at the 

 slightly contracted summit, 

 slightly hispidulous on the 

 crown ; awn 8 to 1 1 cm long, 

 scabrous, twice geniculate. 

 % — Dry pine woods, pen- 

 insular Florida. 



8. Stipa avenacea L. 

 Blackseed needlegrass. 

 (Fig. 895.) Culms 60 to 100 

 cm tall; ligule about 3 mm 

 long; blades 20 to 30 cm 

 long, 1 mm wide, flat or in- 

 volute; panicle 10 to 15 

 cm long, open, the slender 

 branches 2 to 4 cm long, 

 bearing 1 or 2 spikelets; 



glumes 1.5 cm long; lemma dark brown, 9 



or drooping, naked 



Figure 894.— Stipa avena- 

 cioides. Floret, X 1; 

 lemma, X 5. (Curtiss 

 5834, Fla.) 



Figure 893.— Distribution of 

 Stipa richardsoni. 



Figure 895.— Stipa avenacea. 

 Floret, X 1; lemma, X 5. 

 (Kneucker, Gram. 564, Md.) 



Figure 896.— Distribution of 

 Stipa avenacea. 



to 10 mm long, the 



