yo 
26. Stipa L. 
Tufted perennials with narrow compact panicles; snikelets 
l-flowered, disarticulating above the glunes, the articulation oblique, 
forming a blunt or sharp-pointed, hairy cxllus; glumes equal, membranaceous, 
acuminate; lemmas convolute, indurate, terete, awned, the awn twisted and 
twice geniculate, persistent; palea inclosed within the lemma. 
o avms plumose to the second bend@ 5 1. S. Elmeriy 
Oo Awns appressed-pubescent or SCAbTOUSE g 
2, Lemma 8-12 rm. long; terminal segment of aun flexuouse 2% 
26 S. comatas 
2 Lemma less than 7 mm. long; terminal segment of awn eee D 
4 Sheaths and culms glabrous@,} 
G glumes broad, the first 5-nerve dope?” 3. S. Lemmoni 
© Glumes narrower, the first 3-nerved@,> 4. S. columbiane 
Sheaths end culms densely pubescent, esvecially below the nodese>-—<>~ 
4 
Oo. S. Williamsii 
1. S. Elmeri Pivrer and Brodie. —~>vLulms erect, vuberulent, densely 
retrorsely pubescent below the nodes, about 70 cm. tall; sheaths pubescent; 
ligules less than .5 mm. long; bledes flat or involute, densely pubescent 
on both surfaces or nearly glabrous above, as much as 30 cm. long, 2-3 mm. 
wide, those of the innovations longer and more closely involute; pnicles 
nerrow, 10-30, usually ebout 15 cm. long, the brenches evnvressed; glumes 
equal, 3-nerved, membranaceous, 10-12 mn. long, graduclly tepering to a thin 
point; lemma dark brovn at maturity, 6-7 mm. long, the csllus slender, pointed, 
1mm. long; avms twice eniculate, the first two segments twisted and nlumose, 
about 1 cm. long, the third straight, mostly 2 cm. long. 
Dry prairie. 
——> Coeur d'Alene, Rust 347, 
2. Stee comete Trin. and Rurr. —— >Culms in dense tufts, 30-60 cn. 
tall; bledes usually involute, often elongate, firm, scabrous; ligule thin, 
3-4 ma. long; panicle 10-20 cm. long, included et the bese, the slender 
— 
a 
ascendins: branches in rather distant fescicles; glumes thin, attenuate, 1.5 =/ 
2 em. lone; lenma mostly 1 em. long, vele, the densely hairy callus 3 mm. 
long, the body sparsely vubescent or nearly glabrous; awn 10-15 cm. long, 
the terminal segment slender, flexuous. 
