PANK'E.E. 123 



Leaf-blades smootli, 7-12 cm. long, 3-3 mm. wide. Panicles much 

 •exserted, simple. 8-15 cm. long, rays few, elongated, bearing 

 2-4 spikelets near the tips. Spikelets elliptical, acute, i)apillose- 

 hispid, over 3 mm. long, first glume minute, second and third 

 "broad, oval, obscurely 5-7-nerved, palea to the lower floret 0; fer- 

 tile spikelet smooth, elliptical, nearly 3 mm. long. 



Texas, Srridner. 



South Carolina to Florida and Texas. 



31. P. gymnocarpon Ell. Bot. S. C. and Ga. 1: 117 (1816). 

 Perennial; culms rigid, erect, 60-100 cm. high, nodes brown. 



Sheaths shorter than the internodes; blades 20-30 cm. long, 2-3 

 ■cm. wide, lanceolate, flat, broad at the base, smooth except the 

 rough margins. Panicle pyramidal, rigid, the few spreading rays, 

 mostly two or more, from nodes 2-5 cm. distant, 30 cm. long, 18 

 cm. diam. Spikelets on short pedicels, usually in scattered clusters 

 of 3-6, lanceolate, about 6 mm. long, f.rst glume narrow, awn- 

 pointed, 3-nerved, 4-5 mm. long, second and third longer, 

 5-nerved, palea for the third (floral) glume about half as long as 

 the floret; fertile floret very smooth, obovoid, obtuse, 2 mm. long; 

 rachilla about 1 mm. long, separating 2)erceptibly the glumes and 

 florets. 



Louisiana, U. S. Dept. Agricul. 75 from Langlois. 



Banks of rivers. South Carolina to Florida and Texas. 



32. P. virgatum L. Sp. PI. 59 (1753). 



Culms glabrous, firm, 100-160 cm. high, from tufted, peren- 

 nial rootstocks. Ligule often silky-bearded ; blades of culm 30-50 

 -cm. long, flat, firm, with a wide white midrib, the lower ones 1 m. 

 long, 5-10 mm. wide. Panicle exserted, compound, loose and 

 spreading, drooping or erect, 20-50 cm. long. Spikelets scattered, 

 often purplish, mostly in pairs on pedicels 2-5 mm. long, very 

 variable, ovate-acute to ovate-lanceolate, 3.5-6 mm. long, first 

 glume deltoid to ovate-acute, 2-4.5 mm. long, 5-6-7-nerved, 

 second glume ovate, acute or acuminate, 3.5-5.5 mm. long, 5-7- 

 nerved; floral glume of the staminate floret shorter, 5-7-8-nerved, 

 fertile floret ovate, acute or obtuse, 2.3-2.7 mm. long. 



The above measurements were carefully made after examining 



