PANICEJS. 133 



tJ-nerved; floral glume of the neuter floret a little shorter. 

 7-9-iierved, its palea much sliorter; fertile floret half terete, 

 smooth, oval, 2-2.5 mm. long. This was distributed by the U. S. 

 Dept. Agricul. at one time as P. giganteiim Scheele. 



Mexico, Pr ingle 376, Palmer 168*, 206; Arizona, Pringle, 

 distributed as P. capillare (var.?); "West Texas, Nealley, Havard. 



Found in many parts of Texas and Mexico. 



A plant named as above is in the herbarium of the late 

 Dr. G. Thurber, from Kotschyi, iter Nubicum. One very closely 

 resembling it is named P. psilopodiutn, Trin. MSS., identified by 

 General Mimro and now in Herb. Gray of Harvard University. 



In the description above considerable use was made of Yasey's 

 oontribution as above referred to. 



The specimens resemble No. 497 of Pringle's Mexican ])lants 

 named P. diffusum Swartz. 



Found in many parts of Texas and in Mexico. 



50. P. diffusum Sw. Prod. 23 (1788). 



A tufted perennial, hirsute throughout, except the spikelets. 

 sparingly branching below, about 60 cm. high. Leaf-blades flat, 

 «rect, 10-20 cm. long, 6-10 mm. wide. Panicles pyramidal, much 

 exserted or the lowest partially included, 10-15 cm. long, simple, 

 open ; rays mostly single, stiff, spreading. Spikelets pale green, 

 very smooth, single or in pairs, on short pedicels, lanceolate-ovate, 

 about 4 mm. long; first glume acute, half as long as the spikelets, 

 5-nerved; second ovate, acute, 13-nerved; floral glume of the lower 

 floret equal to the second and 11-nerved, its palea half as long; 

 fertile floret oval, almost acute, 2.5 cm. long. 



Mexico, Pringle 497. 



Much like P. Ballii Yasey; but this plant is hirsute, blades 

 longer and wider, the spikelets larger, second glume 13-nerved 

 instead of 9-nerved> third glume 11-nerved in place of 9-nerved. 



Mexico, West Indies. 



51. P. ciliatissimum Buck, fide Yasey, Contrib. U. S. Nat. 

 Mus. 3:29 (1892). 



Culms slender, procumbent or erect, 30-40 cm. high, nodes 

 pubescent. Leaf-blades flat, pubescent, rough with stout hairs on 



