GRAMINE.E. (GRASS FAMILY.) 603 



1. MUHLENBERGIA proper. SpiJcelets commonly much crowded, in lateral 

 and terminal panicles, short-stalked: culms branching, from hard scaly 

 rootstocks: leaves flat. 



* Flowering glume awnless. 



1. M. Mexicana, Triu. Panicles oblong, dense; glumes unequal, 

 lanceolate, ending in slender hispid awn-like points, the upper one as long as 

 the awnless floret. (Agrostis laterinora, Michx.) Damp soil, North Carolina, 

 and northward. June -July. Culms ascending, much branched. 



2. M. glomerata, Triu. Culms erect, simple or branched, 2 high ; 

 panicle loug-peduucled, oblong-linear, interruptedly spicate, 2' -3' long, the 

 den.se oblong clusters sessile and appressed ; glumes nearly equal, awn-pointed, 

 twice as long as the floret. Statesville, North Carolina (Hyams). 



3. M. SObolifera, Triu. Culms branching, 1- 2 high; leaves broadly 

 linear, 3' -5' long; panicle simple, almost filiform, 2' -3' long, the distant 

 branches simple, erect ; spikelets minute ; glumes nearly equal, awnless, rather 

 shorter than the floret. Rocky woods in the upper districts. Sept. 



* * Flowering glume awned. 



4. M. sylvatica, T. & Gr. Culms diffuse, branched (2-3 high); 

 panicles contracted : floret as long as the nearly equal short-awued glumes, its 

 awn 2-3 times as long. North Carolina and Tennessee, in rocky woods. 

 Sept. 



5. M. Willdenovii, Trin. Culms sparingly branched, erect; leaves 

 broadly linear ; panicles linear ; spikelets scattered ; floret twice as long as 

 the nearly equal short-pointed glumes, its awn 3-4 times as long as the spike- 

 let. Dry rocky soil in the upper districts. July- August. Culms 3 high. 



6. M. diffusa, Schreb. Culms decumbent, diffusely branched ; panicles 

 long and slender ; glumes very small, the upper one truncated ; awn of the 

 floret twice as long as the spikelet. Shaded waste places, common. August - 

 Sept. Culms 1- 2 long. 



2. TRICHOCHLOA. Panicle terminal, diffuse, long-peduncled : spikelets on 

 long hair-like stalks : culms tall and simple. 



7. M, capillaris, Kunth. Leaves rigid, elongated, con volute- fili f orm ; 

 panicle erect, the long and purple glossy branches and spikelets drooping ; 

 glumes nearly equal, half as long as the floret, the lower one awued; flower- 

 ing glume 3-awned, with the middle awn many times longer than the spikelet. 

 Varies with both glumes loug-awned. (M. filipes, Curtis.) Sandy soil 

 along the coast, and sparingly in the interior. August -Sept. Culms 2- 

 4 high. 



8. M. trichopodes, Chapm. Culms and leaves filiform, elongated ; 

 panicle erect, oblong; spikelets linear, on spreading stalks; floret twice as 

 long as the nearly equal awnless glumes, ribbed ; its glume tipped with a 

 short awn, and with the two lateral nerves slightly percurreut, hairy at the 

 base. Low pine barrens in the lower districts. Sept. 11 Culms 2 -3 

 high. Panicle rarely purplish. Leaves flat. 



9. M. Reverchoni, V. & S. ? Glabrous; culms tufted, simple (2 high); 

 leaves chiefly radical, short, flat, narrow-linear ; panicle loug-peduucled, siro- 



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