94 PANICACE.E. 



Spikelets rather fiat, oval, abruptly pointed, smooth, pale green, in 

 4 rows or irregularly arranged, 2.5 mm. long, first and second 

 glumes 3-nerved, third a liftle shorter, obtuse. 



Mexico, Palmer 206. 



Texas to Mexico. 



25. P. elatum Rich. Doell, Mart. Fl. Bras. 2, part 2, 78 (1877). 

 Culms erect, glabrous, rooting at the lower nodes, 50-60 cm. 



high. Leaf-blades 20-30 cm. long, 1.5-2.5 wide, fiat, smooth 

 excepting the margins, which are rough, apex narrowly acuminate. 

 Spikes 5-7, 1-3 cm. from each other, 4-8 cm. long, spreading, 

 rachis flat on the back, 2 mm. wide. Spikelets in pairs, in four 

 crowded rows, obovate, subacute, 3 mm, long, first and second 

 glumes with 1 nerve in the middle and 2 near each margin. 



Louisiana, A. B. Lmiglois in 1880. 



Found from Florida to Texas. 



26. P. Buckleyanum Vasey, Bull. Torr. Club, 13: 167 (1886). 

 Culms simple, smooth, decumbent at the base, 60-90 cm. high. 



Leaf-blades scabrous, conduplicate, 20-40 cm. long, 3-4 mm. 

 wide. Panicle erect, 12-18 cm. long; spikes 3-6, alternate, 2-3.5 

 cm. distant, the lower 6-7 cm. long, the upper 3-4 cm. long, 

 rachis straight. Spikelets light-colored, in four rows, the middle 

 ones overlapping for half their length, elliptical, oblong, acute, 

 2.5-2.7 mm. long, first and second glumes sparingly pubescent, 

 3-5 -nerved. 



Xearly related to P. UvicUmi, from which it dift'ers in its longer 

 panicle, more numerous, longer and more distant spikes, and the 

 spikelets pubescent. 



Texas, Buckley and Nealley. 



27. P. vaginatum Sw. Fl. Ind. Occ. 1 : 135 (1797). 



Culms from a creeping base, internodes short, 10-40 cm. high. 

 Leaf-blades smooth, distichous, involute, pointed, 3-9 cm. long. 

 Spikes 2, rarely 3 or 4, 2-6 cm. long, on exserted pedicels. Spike- 

 lets in two rows, overlapping about one fourth of their length, 

 oblong-lanceolate, acute, 4 mm. long, first glume 5-nerved, second 

 2-nerved. 



Florida, A. 11. Curtiss. 



