AliHOSTlDK.E. 299 



very little lonjjer; floral jrlunu' broadly oval, obtuse, sometimes 

 witb a niuero, obscurely IJ-nerveil, 1-1.5 mm. loii«f; ])alea obovato- 

 oval, as loii^j as its glume. 



'I'exas, U. S. Dept. Agrieul. from liVirrr/ion : Colorado. Siri/i- 

 iicr IJIJSOa Wolfe; (.'alil'ornia, J'an'sh 1030; Southern California, 

 I'a/iiu'i- 2;J(). 



Two plants from dilTercnt places in Colorado have !i-;> llorets to 

 i.iie s])ikelet. and most of them distended with smut. 



Hritish America to Arizona. California and Texas. 



A wiry-stemmed species restricted to very wet places, contribut- 

 ing H little to the forage. 



28. S. airoides 'I'orr. Pac. 1{. M. Kep. 7: Part !{. 21 (185(5). 

 Jf/nistifi airoides Toir. Ann. Lye. X. Y. /.•151 (1824). \'i//(i. 

 airoidexTv'm. Steud. Syn. IM. (;ram. 1G2(I855). 



An erect rather stout tufted j)erennial, 40-lK) cm. high; culms 

 enclosed below with prominent wide sheaths. Sheaths a little 

 shorter than the internodes, the throat ciliate; ligule very short; 

 blades light green, soon fading, convolute, tapering to a filiform 

 iipex, those of sterile sliects 2-5 cm. long, l? mm. in width; those 

 of the culm 4-5 in number, the upper filiform, 2-;J cm. long. 

 Panicle termiiud, ovoid, often partly included at tlu^ base, 2()-;U> 

 cm. long, rays solitary in twos or threes, again branching and bear- 

 ing scattered spikelets above the middle. Spikelets light lead- 

 color or brown; empty glumes obovate, without nerves, first 0.5-! 

 mm. long, second 1.5-2 mm. long, floret with a callus; floral glume 

 concave, broadly oval, 1-nerved, 2 mm. long; palea broader than 

 its glume and a little shorter, truncate, infolded between the nerves 

 on the back. 



Kocky iMountains, IT. S. Dept. Agricul. M5; ^fontana. Srrihicr. 



Kansas and Nebraska, Montana, California, Texas, and New 

 Mexico. 



29. S. minutiflorus (Trin.) Link. TFort. Berol. 1:88 (1827). 

 Vilfa miniilifloruH Trin. Unifl. 158 (1S2G). 



Culms slender, snn)oth, 20-40 cm. high. Sheaths 2, ligule very 

 shortly ciliate; blades flat. 3-10 cm. long. 3 mm. or less broad. 

 Panicle terminal, exserted. i)yramidal. 8-10 cm. long; rays solitary 



