144 PANICACEiE. 



New Jersey, Scrihner 3601 from Parker, named by Vasey 

 and Scribner ; Michigan, Wheeler; District of Columbia, Vasey ; 

 Arizona, Pringle. 



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

 spikelets. 



Massachusetts to Oregon, Georgia and Arizona. 



71. P. clandestinum L. Spec. PI. 58 (1753). 



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

 leafy. Sheaths rough with papillae bearing stiff spreading hairs ; 

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

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

 Pa-nicles terminal and usually exserted or lateral and included, the 

 terminal one spreading and pyramidal, 12 by 10 cm. Spikelets 

 oblong, mostly smooth, 3-3.5 mm. long; first glume acute, 

 1-nerved, second 9-11-nerved; floral glume of staminate floret 

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

 long. 



Much like P. latifolium. Culm stouter, branching more 

 freely; panicle with more branches and more spikelets, which 

 are oval. 



District of Columbia, U. S. Dept. Agricul. 54 from CMckering; 

 Philadelphia, Pa., Scrihier 3583; Massachusetts, Sturtevant for 

 M. A. C; 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, Michigan, Texas. 



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



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

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

 long; blades smooth or very sparingly pubescent, cordate, acumi- 

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

 pyramidal, about 30 cm. long; rays smooth, rigid, in twos, threes 

 or single, 3-5 cm. distant; branches few, spreading, 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 



