A(f|{()STIl)i;.K. 'if).") 



A sinootli sk'iidcr l)riincliiiig <,a'niciilate pcri'iiiiiiil, 1(1-40 <iii. 

 lilgli, tilt' iiitiTiiodt'S about 2 cm. loiij;. Sliciitlis mostly shorter 

 tliiiii tlio iiitiTiioili's; li^'uk' 1 mm. or less in Iciij^'th; hhuic involutt.', 

 ohtiisc, 1-1} cm. long. IV'ilunc'lo slonder. l()-ir» cm. long, bearing an 

 open ovoid piinielc :5 cm. long. Km[)ty glumes ('((uul, 1-iierved, 

 '.'..")-:{ mm. long; llond glume '-i mm. long, ;{-ucrved, the uwn H-14 

 mm. long. 



Wet ledges. 



Mexico (.Tulisco). Priiif/h- 4130. 



'.Vi. M. argentea Viisey, Bull. 'Joir. Club, 13: 2;J;» (ISSO). 



A slender glaucous ascending perennial, 4()-fiO cm. high. 

 Leaves of sterile shoots few and stout, short; sheaths of the culm- 

 leaves about (!, longer than the internodes; ligule lam-eohite. S-lO 

 mm. long; blade nearly smooth, loosely involute, S-I.' cm. long, 

 1..")-".' mm. wide. Paidclo narrow or s])reading (y) j)artly included, 

 l','-IS cm. long, vays single or in twos, capillary, branching, tiie 

 longest 5-7 cm. long, thinly llowi-r-bearing for most of their length. 

 Spikelets on pedicels .'J-.s nim. long, light, silvery green or tinged 

 with red; emi>ty glumes subequal, linear-lanceolate, the apex more 

 or less irregularly !i-toothed, l-nerved, ;.'.5-;{ mm. long; floral 

 glume broadly linear, thiidy pubescent on the lower half. 3 mm. 

 long. :5-nerved, with two broad teeth at the i\])v\, the awn (1-15 

 mm. long; palea oval, obtuse, nearly as long as its glume. 



^lexico, /'(i/iiicr KiO. 



:;3. M. tenuiflora (WiUd.) B. S. P. Prel. Cat. N. Y. (17 (1SS8). 

 Jf/rosfix tcnuijhira Wild. Sp. PI. 1: 'MW (ITftS). (Jinua tenuijiura 

 Link, Knum. 1:71 (IH:.'!). MHlileiiben;i(( UV/AA-^/f//-// Trin. Unill. 

 ISS (lS-34). 



Culms upright, rather slender, simple or only sparingly branched, 

 05-90 cm. high, from scaly creeping rootstocks. Sheaths scabrous; 

 ligule about I mm. long; blades flat, thin, pungent-jiointed, sca- 

 brid, 10-14 cm. long, 4-T mm. wide. I'anicle very slender, loosely 

 flowere(l, 20-40 cm. long, rays distant, mostly in pairs, the longest 

 H-10 cm. long, slender. Spikelets on pedicels, the shortest of which 

 are 1-2 cm. long, em])ty glumes subequal, ovate, short-jwinted, 1- 

 nerved, about 'I mm. long; floral glume ovate-lanceolate, IJ-nerved, 



