GRAMINEyE. (GRASS FAMILY.) 553 



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

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

 Culms 3° high. 



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

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

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

 Sept. — Culms 1° - 1 ^° high. 



§ 2. TRICHOCHLOA. — Panicle terminal, diffuse: spikelets on lony 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 paleaj, 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 spikelet. — 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 ; paleoe 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 pcrcurrent, hairy at the base. (Agrostis tricho- 

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

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



11. BRACHYELYTRUM, Beauv. 



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

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

 Lower glume obsolete, the upper minute, persistent and awnless. Paleas 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, Sclireh.) — Dry rocky 

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



12. CALAMAGROSTIS, 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 pale£e. 

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

 Stamens 3. Grain free. 



§ 1. CALAM AGROSTIS Proper. — Glumes and palece memlranaceous, the 

 former boat-shaped : panicle open or loose. 



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

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



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