AGROSTIDE.E. 247 



A soft slender light reddish-greeu, much brauched and difl'use 

 annual. 15-30 cm. high. Sheaths loose, smooth or thinly pubes- 

 cent, about the length of the internodes; ligule very short; blades 

 scabrous aboA'e, involute, spreading, 2-3 cm. long. Panicles mostlj' 

 terminal, exserted, slender, 8-12 cm. long, rays in twos or single, 

 appressed, 1-3 cm. distant, 0.5-3 cm. long. Spikelets in sessile 

 tufts on the shortest rays or on the sides and ajsex of the longest, 

 ones. Empty glumes unequal, hyaline, with 1 stout nerve, oval, 

 the first about 1 mm. long, second 1-1.4 mm long, including the 

 awnlike points; floral glume thin, linear-lanceolate, only a pencil- 

 tuft of liairs at the base, 3-nerved, 1.5 mm. long, the awn 1.5-2.5 

 mm. long; palea and grain linear, about the length of the floral 

 glume. 



Mexico, Pyingle 1775, 2747. 



Wet ledges, Mexico. 



IS. M. nebulosa Scribn. ined. 



A slender pur])lisli densely tufted much-branched diffuse- 

 annual, 8-12 cm. high. Ligule hyaline, 1 mm. long; blades soft^ 

 scabrid, involute, narrow, 1-2 cm. long. Panicles o])en, linear, 

 3-5 cm. long, rays single, rather stout, spreading, branched, bearing 

 5-10 spikelets each. Spikelets on short pedicels; empty glumes 

 ovate-lanceolate, 1-nerved. flrst 0.5 mm. long, second 0.7 mm. 

 long; floral glume lanceolate, hyaline, pubescent on the margins, 3- 

 nerved, 1.4-1.5 mm. long, 2-toothed, the awn 3-5 mm. long; 2)alea 

 as long as its glume. CI rain lance-ovoid 0.9 mm. long. 



Mexico, Pr ingle 236C, in 1889. 



Wet places, hills near Guadalajara. 



19. M. Buckleyana Scribn. Vasey, Contrib. U. S. Nat. Herb- 

 3 :69 (1892). 



A slender diffuse freely-branching annual, 20-40 cm. high, often 

 purplish. Ligule acute, 1.2-5 mm. long; blades scabrid, convo- 

 lute or flat, 3-6 cm long, 1-2 mm. wide. Panicles mostly included 

 at the base, slender, open, linear to oval, 10-25 cm. long, ra3'^s sin- 

 gle, scattered, capillary, sparingly branching, the longest 5-8 em. 

 long. Snikelets mostly on pedicels 1-3 mm. long, from branches 

 along the upper three-fourths of the rays; empty glumes hyalineji. 



