244 I'OACK^J. 



lute or flat, often rpcurvcd, I 5 'i.rt om. lonpf. about 1.5 mm. 

 wide. I'anido simplo, nicuiiioMo, D-O cm. lon^; rt.^3 single, hiiIisc- 

 c'uiul, rocurvi'il. nowcr-bourinj,' tliroii^'liout, 1 -2 ru\. Ion;;. S|)ikelt!ts 

 mostly sossiliv. oiiipty ^'Iuimcs sub('(|uiil. l-rjcrvcd, 1. :{-!.<> iimi. Ion;;, 

 hull' of which is thf iiwn ; lloriil ;;Mitiio thin, lincur-hincRoiuto, pubes- 

 cont on 2 ol" the lutiTiil iicrvi'S, .O-iuTvod, the intorniodiiito hitorul 

 nerves obscure, 2 nun. Um^, the iiwn 1-20 mm. Ion;;; ])ulea linear- 

 lauceolate, 2-toothed, as long us its glume, (irain linear, 1.5 mm. 

 long. 



Mexico, Prinf/h WMi. lH4r>; tlie later luis the longer awns witli 

 floral glume less pubescent. 



Mexico. 



11. M. stipoides (II. H. K.) Trin. l^iifl. 104 (1824). Pofln- 

 S(Pmuni slijwides II. H. K. Nov. (Icn. et. Sp, 1: \',\\ (1H15). 



A strict tufted grass 40-(5() (^ni. high. (Julnis rather stout. 

 Loaves of the culm 4, sheaths riblu'd, mostly longer ihan tiio inter- 

 nodes; ligule narrow, 5-7 mm. long; bhides strict, scabrid, invo- 

 lute, 0-15 cm. long. I'anicle simple, narrow, (J-IO cm. long; rays 

 in threes, the longest 5-(( cm. long, including the 3-4 spikelets on 

 the outer half. Spikelets olive-green, brown lit the base, empty 

 glume 1 -nerved, ovate-lanceolate, (irst 5 nmi. long, second 7 mm. 

 long; tuft of hairs at base of floret 2 mm. long, floral glunu' I".' mm. 

 loiig. 5-nerved, the twisted aww ratlier stout, 12-15 mm. long, 

 starting 4 mm. below the slender ujjcx of the glume; palea about 

 the length of its glume. 



(Irowing at the altitude of 10,;U)0 feet. 



Mexico. Pri)if//c 4005. 



12. M.sobolifera (Muhl.) Trin. Unifl. ISO (1824). 



Agrosfix solmlifcva Muhl.; Willd. Knum. 05(1800). Trirhn- 

 chloa ftoholifeni Trin. Fund. Agrost. 117(1820). Ciiiufi suhlifera 

 Link, llort. Herol. 1:71 (1821). 



A slender ascending perennial, rarely branching, 30-(iO cm. 

 high, from creeping, scaly rootstocks. Sheaths longer than the 

 internodes; ligule a mere ciliate ring; blades flat, scabrid, pungent- 

 pointed, 5-10 cm. long, 3-5 mm. wide. Panicle very simi)le, slen- 



