GRAMINE^E. (GRASS FAMILY.) 553 



glumes, the lower one with an awn 3-4 times as long as the spikclct. (Agros- 

 tis tenuiflora, Willd.) Dry rocky soil in the upper districts. July and Aug. 

 Culms 3 high. 



3. M. diffusa, Schreb. Culms diffusely branched, low ; panicles long and 

 slender ; glumes very small, the upper one truncated ; awn of the palca twice as 

 long as the spikelct. Shaded waste places, Florida, and northward. Aug. and 

 Sept. Culms 1 - 1 high. 



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

 like stalks : culms tall and simple. 



4. M. capillaris, Kunth. Leaves rigid, elongated, convolute; panicle 

 erect, the long and purple glossy branches and spikelets drooping ; glumes nearly 

 equal, half as long as the paleaa, the lower one awned ; palea? unequal, the up- 

 per one barely awned, the lower 3-awned, with the middle awn many times 

 longer than the spikelct. Varies with both glumes long-awned. (M. filipes, 

 Curtis.) Sandy soil along the coast, and sparingly in the interior, Florida, and 

 northward. Aug. and Sept. Culms 2 -4 high. 



5. M. trichopodes. Culms and leaves filiform, elongated ; panicle erect, 

 oblong ; spikelets linear, on spreading stalks ; paleas twice as long as the nearly 

 equal awnless glumes, ribbed ; the lower one tipped with a short awn, and with 

 the two lateral nerves slightly percurrent, hairy at the base. (Agrostis tricho- 

 podes, Ell. Low pine barrens, Florida to North Carolina. Sept. ty Culms 

 2 - 3 high. Panicle rarely purplish. Leaves flat. 



11. BRACHYELYTRUM, Beauv. 



A perennial erect grass, with a simple slender culm, flat lanceolate leaves, 

 and a loose lanceolate simple panicle of large (^' long) 1-flowcred spikelets. 

 Lower glume obsolete, the upper minute, persistent and awnless. Palcas rigid, 

 rough with short bristly hairs, the lower one concave, 5-ribbed, tapering into a 

 long straight awn, and enclosing the shorter 2-pointed upper one. An awn-like 

 pedicel of a second flower is applied to the back of the upper palea. Stamens 

 and long stigmas 2. Grain linear. 



1. B. aristatum, Beauv. (Muhlenbergia erecta, Schreb.) Dry rocky 

 places, Florida, and northward. July. Culms solitary, 2 -3 high. 



12. CALAMAGROSTTS, Adans. REED BENT-GRASS. 



Perennial grasses, with rigid erect simple culms, bearing a loose or contracted 

 panicle of 1 -flowered spikelets, with the hairy pedicel of a second flower at the 

 back of the upper palea. Glumes 2, nearly equal, keeled, longer than the paleae. 

 Palese 2, bearded at the base with long hairs, the lower one awned on the back. 

 Stamens 3. Grain free. 



1. CALAMAGROSTIS PROPER. Glumes and palece membranaceous, the 

 former boat-shaped : panicle open or loose. 



1. C. coarctata, Torr. Panicle contracted, lanceolate; glumes lance- 

 olate, awl-pointed, rough-keeled, with a purple stripe near the margins ; lower 

 47 



