AUUOSTIDK.E. 



287 



Fig. ii2.~Sporoboliis interrnplni^. 

 A, sitikelt't; b, floret. (S('ril)iu'r. ) 



jifhimo oval, acute, I-irtvchI. 5 mm. long: palea but little shorter, 

 eniiirjriiiato, infokled on the back between the nerves. 



Arizona, .Ioiivk, Coucs d* Pul- 

 iiier uO, (J(). 



3. S. asper (Miclix.). Kunth, 

 l{ev. Gram 1 : (58 (18-,>!»). A(/ro,sfi.s 

 uspcrn Michx. Fl. ]5or. Am. L. 

 5'2 (ISO;}). ]'ilf)i uspera lieauv. 

 Af,n-o.st. IG (1812). Atjrosfis 

 cUnulcstina j\Iuhl. (h'am. 73 

 ( 1 8 1 T ) . A. loiir/i'foh'a Torr. Flor. 

 U. S. 1 : 90 (1824). Muhlenheniia 

 vlandcxtina 'J'rin. rnifl. 190 

 (1824). *S'. itirolu/a Muhl. Gram. 

 72 (1817). 



A very variable tufted perennial, GO-lOO cm. liigh ; culms solid 

 as tliose of !Maize. Leaves of sterile shoots as long as the culm, 

 or more tlum half as long, Ijlades involute, tapering to a long thr nid- 

 like point, tliose of the culm 5-7 in number, narrow with slender 

 points, all blades rougli on the edges, sheaths often distended with 

 lateral paiiicles ; ligule very short, throat ciliate. Panicles terminal 

 and lateral, partly or almost wholly enclosed in the sheatlis, spike- 

 like, 5-15-30 cm. long, the rays erect, 3-8 cm. long. Empty glunu's 

 ovate-lanceolate, keeled, 1-nerved, first 2-3 mm., second 3-4-5 mm. 

 long; fioral glume pubescent or smooth, like the second glume, oidy 

 1-2 mm. longer; palea pubescent or smooth, acute, extending 

 beyond its glume, or else obtuse, and equalled l)y or even shorter 

 than its glume. Grain broadly elliptical, 1.5 mm. long. 



Massachusetts, Cooky; Alabama, McCarthy; Texas, Kealley\ 

 Arkansas, Harvey 22. 



Found from New England to Texas. 



Yar. Drummondii Yasey, Contrib. U. S. Nat. Herb. 3 : 60 

 (1892). Vilfa Drvmmondii Trin. 



Culms very slender; panicles mostly terminal, only exserted or 

 partially included ; no lateral panicles, or very small ones. 



Texas, lieverchon 1047. 



