gra.mim i:. (GRASS family.) 559 



2. L. dubia, Nees. Culms 2° high, Blender; loaves elongated, filiform, 

 with smooth sheaths ; spikes 6 - 10, somewhat corymbose; spikelets distant on 

 the filiform rachis, 6-flowered ; glumes lanceolate, nearly equal, serrulate on the 

 keel, shorter than the awnless soon spreading flowers ; palese fringed on the mar- 

 gins, the lower one truncate or emarginate. — South Florida. 



$ 2. DIPLACHXE. — Lower pah a deleft, \-3-awned. 



3. L. polystachya, Kunth. Culms £°-4° long, mostly prostrate and 

 rooting at the lower joints, niiirh branched ; raceme partly included in the 

 sheaths of the elongated leaves; spikes numerous, approximate, erect, 3' — 5' 

 long; spikelets lanceolate, 8 - 10-flowcred ; glumes unequal, shorter than the 

 flowers; lower palea hairy on the margins below, 3-awned; the lateral awns 

 minute, the middle one about as long as the palea. (Festuca polystachya, 

 Michx.) — Brackish swamps along the coast, Florida, and northward. Sept. (T) 



4. L. Domingensis, Link.? Culms erect, simple, straight and slender; 

 leaves narrowly linear or filiform, shorter than the culm ; spikes 6- 12, scattered, 

 exserted; spikelets lanceolate, 6 - 8-flowered ; glumes unequal, acute, rough- 

 keeled; lower palea hairy on the margins, much longer than the single rough 

 awu. — South Florida. Oct. — Culms 1° - U° high. 



24. TRICUSPIS, Beauv. 



Perennial grasses, with tall, erect, simple culms, from a thick and scaly root- 

 stock, elongated rigid leaves, and ovate or lanceolate 5 -7-flowered stalked spike- 

 lets, disposed in a simple or compound open panicle. Glumes 2, smooth, emar- 

 ginate, shorter than the crowded flowers. Paleaj 2, 2-cleft, the lower one shortly 

 3-awned by the percurrent hairy nerves, bearded at the base. Stamens 3. Grain 

 obovate-ohlong, free. 



1. T. sesslerioid.es, Torr. Panicle ample and diffuse, or contracted and 

 erect, bearded in the axils; spikelets terete, lanceolate, mostly purple; lower 

 palea with two awn-like teeth similar to the three short awns. (Poa quinquilida, 

 Pursh.) — Dry soil. Florida, and northward. Aug. and Sept. — Culms 3°-5° 

 high. Sheaths often hairy. 



2. T. ambigua. Panicle short, nearly simple, spreading, smooth in the 

 axils, clammy ; spikes ovate or roundish, compressed ; teeth of the lower palea 

 obtuse, wider than the three short awns. (Poa ambigua, Ell.) — Low pine bar- 

 rens, Florida to South Carolina. August. — Culms 2° -3° high. 



25. TRIPLASIS, Beauv. 



Low tufted fibrous-rooted grasses, with branching culms, linear-subulate leaves, 

 and few 4-flowered purple spikelets, disposed in reduced lateral ami terminal 

 panicles. Flowers scattered on the slender rachis. Glumes 2, lanceolate, smooth. 

 Palese 2, hairy on the margins ; the lower one 2-cleft, with a bearded or plumose 

 awn between the teeth ; the upper concave, 3-toothed. Stamens 3. Grain free. 



1. T. Americana, Beauv. Culms erect, l°-lj° high; leaves and sheaths 



hairy; lateral panicles included ; awn of the lower palea plumose, much longer 



