228 POACE.E. 



toothoil, fleliciitc'ly o-iiervt'd nour the luise. greenish wliito; floral 

 glume elotlied with short hairs and very siiort tufts near the base. 



'' It has much the habit and appearance of (). Cdnmh'nsis 

 Torr., but dilTers essentially in its simple and contracted panicle, 

 its shorter outer glumes, and its longer and somewhat persistent 

 uwn." Sciibn. Coult. Hot. (iaz. Jl: 1G1> (1S80). 



Montana, Williams ; Wyoming, Ihifftiin c 2, c 71. Oregon, 

 Cunirk- for U. S. Dti)t. Agri(.ul. 2!)4. 



Oregon to Montaiui. 



7. O.juncea (Michx.) U. S. V. I'rel. (^at. N. Y. G7 (1.S8S). 

 Stipa juiicea Michx. Fl. Hor. Am. 1: 54 (180:5). Stijiti Cauadciixis 

 Poir. Lam. Encyl. 7: 452 (180(.i). A/ilium ptoujens 'Vow. Fl. U. S. 

 1:78 (1824). O. Catiai/oisis 'Vow. Fl. N. Y. 3:4;31J (1843). 



Culms slender, 20-40 cm. high. Hheaths rough; ligule not 

 ciliate. ;i-4 cm. long; blades scaltrid, those of the culm very short 

 or sometimes long, those below tapering into a i)etiole, firm, invo- 

 lute, 15-20 cm. long. 2 mm. wide, when spread. Panicle exserted, 

 simple, narrow or diffuse, 4-8 cm. long. Spikelets elliptical, acute, 

 about 4 mm. long, awn short and deciduous or wanting, empty 

 glumes subequal, first oval, truncate, membranous with 5 incon- 

 spicuous nerves below, second a little narrower; Horet whitish, 

 pubescent, with a very short thin tuft at the base, 



Vern)ont. U. S. Dei)t. Agricul. 292, from Prinyle ; Massachu- 

 setts, Coolcy ; Tihode Island, Clark 3207; IMichigau (Keweenaw), 

 Wood, Wheeh'v ; },l'umcsota, Sfa/r Siiri'ey '38. 



Northern States to Colorado, May. 



8. 0. Hendersoni Vasey, Contrib. U. S. Nat. Herb. 1:267 

 (1803). 



A densely tufted grass. 15-20 cm. high. Lower sheaths rather 

 loose; blades scabrous, conduplicate, rigid, pungent, 8-10 cm. long. 

 Panicle narrow. 5-S cm. long, rays mostly in twos, the longest .3-5 

 cm. long, bearing 2-4 spikelets near the apex. Spikelets 4 mm. 

 long, em])ty glumes broadly oblong, obtuse and toothed, first .'5- 

 nerved, second 5-nerved; floral glume linear-oblong, 3.5 mm. long, 

 smooth, coriaceous, obscurely 5-nerved, bearing 2 lateral teeth, awn 

 curved, caducous, 10-12 mm. long. 



