68 



flower attenuate. Palets shorter, two-keeled, two-toothed at the 

 apex. 



1. E. Bigelovii, S. W. New Mexico. 



2. E. Kingii, S. W. Nevada. 



Sclebopogon, Philippi. 



Spikelets unisexual, two to many flowered, in a narrow, scanty 

 panicle, the rhachilla elongated in each sex. Male spikelets, rha- 

 chilla glabrous, inarticulate, glumes paleaceous, narrow, acute, uu- 

 awned, three-nerved, the lower ones a little shorter and unequal, 

 the flowering ones sometimes minutely three-toothed at the apex, 

 the middle tooth mucroniform, palet narrow, rigid, about as long 

 as the glume, two-keeled, two-toothed. Female spikelets, one to 

 many flowered, the upper ones sterile, the two lower glumes per- 

 sistent, very unequal, larger than in the male spikelets, flowering 

 glumes many, rigid, narrow, convolute around the flower, the three 

 nerves or ribs produced into very long, slender, rigid, often some- 

 what twisted awns, with three short, lanceolate hyaline lobes on the 

 margin of the lateral awns and between the awns, the upper sterile 

 flowering glumes similar ; palet rigid, narrow, included in the flow- 

 ering glumes. 

 1. S. Karwinskianus, Benth. Texas to Arizona. 



Akundo, Linn. 



Tall grasses with an ample panicle, spikelets two to many flowered, 

 the flowers rather distant, silkj, villous at the base and with a con- 

 spicuous silky-bearded rhachis, all perfect; outer glumes narrow, un- 

 equal, glabrous, lanceolate, keeled, acute ; flowering glumes mem- 

 branaceous, slender, awl-pointed ; palets much shorter than the 

 glumes, two-keeled, pubescent on the keels. 

 1. A. Donax, Linn. Giant Reed Grass. Texas and Arizona. 



This grass is often cultivated for its very ornamental plumes. It 

 is a native of Southern Europe, but is well established on the bor- 

 ders of the Rio Grande river, where it is probably indigenous. 



Phragmites, Trin. 



Only differing from Arundo in the lowest flower of the spikelet 

 being male only and glabrous. 



