144 PANICACE.E. 



Now Jersey, Scribner 3601 from Parker, named by Vasey 

 and Scribner ; Micbigan, Wheeler j District of Columbia, Va/^ei/ ; 

 Arizona, Pritiyle. 



In all tbe above there is a remarkable uniformity in size of 

 S])ikelets. 



Massachusetts to Oregon, (leorgia and Arizona. 



71. P. clandestinum L. Spec. PI. 5S (17"):$). 



Perennial, from tufted rootstocks. Culms stout, erect, very 

 leafy. Sheaths rough with papilltB bearing stiff spreading hairs; 

 bhides oblong-lanceolate, 12-15 cm. long, 2-3 cm. wide, from a 

 heart-shaped base; apex long, wedge-shaped, rough or smooth. 

 Panicles terminal and usually cxserted or lateral and included, the 

 terminal one spreading and pyramidal, 12 l)y 10 cm. Spikelets 

 oblong, mostly smooth, '.\-',].i\ mm. long; iirst glume acute, 

 1-nerved, second !)-ll-nerved; floral glume of staminate lloret 

 7-11-nerved, its palea present; fertile floret oval, subacute, 3.5 mm. 

 long. 



Much like P. htfifdJium. Culm stouter, branching more 

 freely; panicle with more branches and more spikelets, which 

 are oval. 



Distri(>t of Columbia, IT. S. Dept. Agricul. 54 from CJiirlrrhifj; 

 Philadelphia, Pa., Scribner 358;); ^lassachusetts, Sturtevauf for 

 M. A. V.\ Pennsylvania, Dr. Clark 2371; New Jersey, Herb. 

 Univ. of Mich. Also No. 125 presented by S. S. Garrigues to 

 Univ. of Mich. The sheaths of the latter feel smooth to the touch. 



Low land, Massachusetts, ^lic^higan, Texas. 



72. P. Oaxacense Steiul. Syn. PI. Gram. 73 (1855). 



Culm smooth, erect, stout, 2-2.5 m. high. Sheaths shorter 

 than the internoues, ciliate on the margins above; ligule 1-2 mm. 

 long; blades smooth or very s})aringly })ubes('ent, eonlate, acumi- 

 nate, at least 10-20 cm. long, 1.5-3 cm. wide. Panicle ojien, 

 pyramidal, ab(nit 30 cm. long; rays smooth, rigid, in twos, threes 

 or single, 3-5 cm. distant; l)ranches few. sju'eading, bearing 2-10 

 spikelets. Spikelets subsessile or on pedicels 1 mm. to 4 cm. long, 

 globose, oval, 4 mm. long; first glume concave, ovate-deltoid when 

 spread, 7-nerved, 3 mm. long; second glume and floral glume of 



