AliUOSTlDE/E. 20;^ 



Arizona. f\ S. Dcpl. Afjn'ciih ;522 from Jonos. 



Neltruska, Colorado, Now .Mexico, Arizona, Utah. Known in 

 Arizona as Hhifk (lanm or (lama China. 



4S. M. tenella (II. \\. K.) Trin. Unifl. 103 (18-^4). Pudnsn'- 

 iinini ti'ncUuiii II. W. K. Xov. (ien. et. Sp. 1:1:28 (1815). 

 Trirhorhlm tviivlht W. & S. Syst. ;.' : ;}8.-) (181 1). 



A slender liirht rcddish-g'rcen. mnch-branclicd and dilTusc an- 

 nnal. lo-'^O om. high. Sheaths rrt'qnently erowded from, and bnt 

 little lon<!:er than, the iuternodes; lignlea filiate rin<r; blades thin. 

 Hat or involnte, often pubeseent, :l-i) cm. long. 1-1. o mm. wide. 

 J'anieles lateral and terminal, slemler, interrupted, spikelike. 8-1^2 

 cm. long; rays single or in twos, the longest 1 cm. long. 8j)ikelets 

 sessile or on pedicels \-'l mm. long; empty glumes l-nerved, sub- 

 equal. 1.0-3 mm. long, incliuling the bristle-point or awn; lloral 

 glume lanceolate, o-nerved, about \\.\ mm. Avhen spread. aj)[)earing 

 shorter, graduidly tapering to the awn, which is 1.5 cm. long; i)alea 

 very narrow, as long as its glume. (J rain hmeeolate, 5i.O mm. long. 



Mexico, Pahner 481. Pri»>/h ITo, 1745. 



4i>. M. 8trictior(Scribn.). .]/. Jlnridn yav. s/ rid ior Scrihn. ined. 



A soft annual, much branched from near the base, "^'O-^O cm. 

 high. Sheaths shorter than the internodes; ligule acute, 3 mm. 

 long: blades scabrous, involute or tlat, 2-5 cm. long, i-'i mm. 

 wide. Panicle linear, erect, yellowish or reddish green, 4-8 cm. 

 long, rays single or clustered, s})aringly branching, bearing 10-15 

 si)ikelets along the entire length. Spikelets on pedicels mostly 

 about 1 mm. long; empty glumes equal, thin, linear-lanceolate, 1- 

 nerved, 2.5-3.8 mm. long; tloral glume almost hyaline, lanceo- 

 late, pubescent on tin? nnirgins, 2-toothed, 3.5-3.8 mm. long, the 

 awn 1.5-2 mm. long; palea 2-toothed, as long as its glume. An- 

 thers linear, 0.8 mm. long. 



Mexico, Prinyle 1418. 



50. M. Arizonica Scribn. Hull. Torr. ("lub, 15: S (1888). 



A densely tufted perennial; culms slender, erect, 15-35 cm. 

 high. Ligulo thin, 1.5-2 mm. long; blades scabrid on the mar- 

 gins and keel, flat or conduplicate. 3-5 cm. long, 1-1.5 mm. wide, 

 pungent-pointed. Panicle purjjle. thin, ovoid, 8-18 cm. long, rays 



