GKAM1NE.E. (/JRASS FAMILY.) 559 



2. L. dubia, Nees. Culms 2 high, slender; leaves elongated, filiform, 

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

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

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

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



2. DIPL ACHNE. Lower palm 2-cleft, 1 - 3-awned. 



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

 rooting at the lower joints, much 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. (l) 



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 

 awn. South Florida. Oct. Culms 1 - 1 high. 



24. TRICTJSPIS, 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. Palese 2, 2-cleft, the lower one shortly 

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

 obovate-oblong, free. 



1. T. sesslerioid.68, 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 quinquifida, 

 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 and terminal 

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

 Paleae 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, 1 - 1| high ; leaves and sheaths 

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



