466 POACE^. 



A smooth erect mtlier slender grass, GO-OO cm. lii^'li. Slieutlis 

 sliorter tlian the intcrnodes, compressed; ligule a ciliate rin^'; blades 

 of the culm 3-4 in number, Hat, 20-40 cm. lon^, ;{-4 mm. wide, the 

 apex lon<^ and slender. Panicle much exscrted, becoming ovoid or 

 l)yramidal, 10-14 cm. long, rays mostly single, smooth in the axils, 

 clammy, rarely branching, bearing nearly sessile spikelcts on the 

 outer three-fourths. Spikelcts purple, ovate, oval or deltoid, com- 

 pressed, 5-7-ll()Wcrcd, 5-6 mm. long; empty glumes 1-nerved. 

 ovate, acute or '^-toothed, 3 mm. long with a mucro; lloral glume 

 villous on the nerves, oval, 3 nwn. long, with three short awns; 

 palea ovate, obtuse, the folded margins wide, 2.3 mm. long. 



Florida, (furfis.s 34r)5; Texas, /'. ,S'. Depf. Atjnnd. 530. 



Florida, Texas to Arizona. 



G. S. Americana (Heau v.). Trij)hisis Ameriatmt Vk'^ww k^vo^i. 

 81, /. 10./. 10 (1812). 



A slender erect pur})lish grass, 40-90 cm. high; nodes pubes- 

 cent. Leaf-blades scabrous above, those of the culm 1-8 cm. long, 

 those of the sterile shoots 10-20 cm, long, 1.5-2 mm. wide. Pan- 

 icles thin, simple, the lateral ones included by the sheaths of the 

 leaves, the terminal exserted, 2-5-10 cm. long, rays capillary. 

 Empty glumes obtuse or lobed, 3.5-4 mm. long; iloral glume 

 linear-lanceolate, about 5 mm. long; awn pubescent, 5-7 mm. long 

 from where it leaves the notch of the glume; palea 3 mm. long, acute. 



Alabama, Mohr; Florida, Curtiss 345T, (ritrher, Chapnuot; 

 Louisiana, LmKjhns in 1882; Mississippi (Ocean Springs), Tracy. 



Low pine-b.irrc:is. North Carolina to Florida and Mississippi. 



T. S. Texana (Thurb.) Kuntze, Rev. (}en. PI. 2: 780 (KS!>1). 

 Tricus^iis Texaim Thurb. S. Wats. Proc. Am. Acad. 18:180 

 (1883). 



A slender erect tufted grass, 50-70 cm. high, culm, leaves, and 

 branches of i)anicles more or less pubescent with short spreading 

 hairs, the nodes glabrous. Sheaths shorter than the intcrnodes, 

 villous at the throat; lignle a mere ring; blades mostly involute, 

 15-20 cm. long, 1.5-3 mm. wide. Panicle thin, diffuse, 10-15 

 cm. long, rays single, hairy in the axils, longest 4-7 cm. long, 

 bearing 3-5 spikelcts above the middle. Spikelcts ovate-oblong, 5- 



