46 PANICACE^. 



on one edge of the stipe bearing liairs 2 mm. long. Sessile spike- 

 let 7 mm. long; first glnme flattened, 9-nerved, ovate-lanceolate 

 witli 2 ciliate keels; second glnme shorter, thinner, keeled, 3-nerved; 

 third still shorter, hyaline; fonrth bifid, bearing a twisted awn 1 cm. 

 or more in length. Pedicellate sj^ikelets 2-4 mm. long, consisting 

 of 1-3 empty glumes. 



Mexico, Wright 2105, PringU 382, Greene 40G; Texas, Neal- 

 ley 598. 



A neat slender grass found in New Mexico, Arizona, and north- 

 ern Mexico. 



G. A. scoparius Michx. FL Bor. Am. 1 : 57 (1803). A. 2nir- 

 pnrascens Muhl. ; Willd. Sp. PL 4 : 913 (1806). 



Culms slender, 60-90 cm. high, with numerous branches. Sheaths 

 sparingly hairy; blades 2-3 mm. wide. Spikes slender, scattered, 

 usually 2-3 from a single sheath, exserted on slender pedicels, the 

 joints of the rachis clothed on the two edges with lax dull-white 

 hairs. The sterile spikelet consists of a single glume about 3 mm. 

 long, or staminate and longer. First and second glumes of the 

 pistillate spikelet lanceolate, 6 mm. long, and awn-pointed; first 

 glume flattened on the back, scabrid, obscurely nerved; second 

 glume thinner, keeled, 3-nerved ; fourth bifid for one third its 

 length, bearing in the notch an awn 10-15 mm. long. 



From the Atlantic to the Eocky Mountains. Very common on 

 the prairies, affording considerable pasture; sometimes cut for hay. 

 It starts very late in the spring and is damaged by frost. 



Subspecies euscoparius Hack. D. C. Monog. Phan., 1. c. Low 

 tufted; sheaths smooth; blades glaucous, scabrous, 5-7 mm. wide; 

 first and second glumes of sessile spikelet 8 mm. long, with points 

 2 mm. long. Specimens marked " teste E. Hackel " owned by F. 

 L. Scribner, Sands of Cape May, N. J. Coll. J. Burk, Oct. 2, 1888. 



Subspecies genuinus Hack., 1. c. 



Pedicellate spikelets 2-3 mm. long, subulate; first glume 3- 

 nerved, terminating in a bristle; branches filiform, glabrous below 

 the nodes; racemes slender ; very variable. Michigan (M. A. C. 3), 

 Cooley, Beal 5; Illinois, Beal A; Penn., Scribner d(J3^; Vt., Prin- 

 gle; N. J., TJ. 8. Dept. Agrir. from Scribner 200; Texas, Nealley. 



