AGliOSTIDE.E. 247 



A soft slender light reddish-green, mucli brauehed and dill'iise 

 unnnul, 15-30 cm. higli. Sheaths loose, sniootli or tliinly j)nb('S- 

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

 scabrous above, involute, sjjreading, 2-3 cm. long. Panicles mostly 

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

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

 tufts on the shortest rays or on the sides and apex 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, oidy a pencil- 

 tuft of hairs at the base, 3-nerved, 1.5 )nm. long, the awn 1.5-2.5 

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

 glume. 



:dexico. rriiKjiv i:;5, 2747. 



Wet ledges. Mexico. 



18. M. nebulosa Sctribn. ined. 



A slender purplish densely tufted much-branched diffuse 

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

 scal)rid, involute, luirrow, 1-2 cm. long. Panicles open, linear. 

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

 5-10 spikelets each. 8i)ikelets on short jjcdicels; empty glumes 

 ovate-lanceolate, 1-nerved. first 0.5 mm. long, second O.T mm. 

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

 nerved. 1.4-1.5 mm. loiij. 2-toothed. the awn 3-5 nun. long; palea 

 as long as its glume, (train lance-ovoid 0.!) nnn. long. 



Mexico, I'n'iif/Ie 230G, in lS8!t. 



Wet places, hills near Cimidalajara. 



lit. M. Buckleyana Scribn, Vasey, Contrib. U. S. Nat. Herb. 

 3:G!) (1802). 



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, rays sin- 

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

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

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



