266 NORTH AMERICAN FLORA [Volume 17 



obovate (oblong before maturity), pubescent; first glume distant, half as long as the spikelet 

 or more, subacute, 5-7-nerved; second glume scarcely equaling the fruit and sterile lemma; 

 fruit short-stipitate, 2.5 mm. long, 1.4 mm. wide, elliptic, acute. 



Autumnal phase more or less decumbent-spreading, branching from the lower and middle 

 nodes, the branches appressed and later rather sparingly producing appressed fascicled branch- 

 lets, the reduced blades stiff, erect, and involute-pointed. 



Type locality : Kustis, Florida. 



Distribution: Florida. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 389; Contr. U. S. Nat. Herb. 15:/. 257. 



155. Panicum Commonsianum Ashe, Jour. EHsha Mitchell Soc. 15: 



55. 1898. 



Vernal plants grayish-olive, drying brownish; culms usually in dense tufts 20-50 cm. high, 

 stiffly ascending or spreading, papillose-strigose to appressed-pilose, the hairs at the nodes more 

 spreading; leaf-sheaths shorter than the internodes, strigose to appressed-pilose like the culms 

 but less densely so; ligule 1 mm. long or less; blades firm, stiffly ascending, 5-8 (rarely 9) cm. 

 long, 4-7 mm. wide, broadest near the rounded base, the serrulate, cartilaginous margin in- 

 volute toward the acuminate apex, glabrous on the upper surface or with a few long hairs to- 

 ward the base or margin, strigose on the lower surface or glabrous; panicles long-exserted, 

 4-8 cm. long, about as wide, loosely flowered, the axis and branches strigose to nearly glabrous, 

 the branches stiffly spreading, spikelet-bearing toward the ends; spikelets 2.2-2.4 mm. long, 1.2 

 mm. wide, elliptic, subacute, pubescent; first glume about half as long as the spikelet, some- 

 times longer, usually pointed, 3«nerved; second glume slightly shorter than the fruit and sterile 

 lemma at maturity; fruit 2 mm. long, 1 mm. wide, elliptic, subacute. 



Autumnal culms branching from the middle and upper nodes, after the maturity of the 

 primary panicles becoming spreading or prostrate, the larger clumps forming mats in the sand, 

 the reduced secondary subinvolute blades rather crowded, stiffly ascending, overtopping the 

 panicles; winter blades lanceolate, commonly more hairy than those of the culm. 



Type locality: Cape May, New Jersey. 



Distribution : Connecticut to northern Florida. 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 259; Britt. & Brown, 111. Fl. ed. 2./. 367. 



156. Panicum Addisonii Nash, Bull. Torrey Club 25: 83. 1898. 



Panicum Owenae Bickn. Bull. Torrey Club 35: 185. 1908. 



Vernal phase similar to that of P. Commonsianum and often closely resembling that species; 

 culms more slender, rarely as much as 40 cm. high, appressed or ascending-pilose at least below, 

 puberulent above; leaf-sheaths sparsely ascending-pilose; blades stiffly ascending, 4-7 cm. 

 long, 3-6 mm. wide, involute-pointed, glabrous on the upper surface, sometimes with a few 

 long hairs near the margin, pubescent or glabrous beneath; panicles long-exserted, 2-6 cm. 

 long, two thirds to three fourths as wide, the stiff branches ascending, the panicle thus appearing 

 more densely flowered; spikelets 2-2.1 mm. long, 1.1 mm. wide, obovate, blunt, papillose-pubes- 

 cent, or the papillae obscure; first glume one third to half as long as the spikelet, usually pointed; 

 second glume and sterile lemma barely equaling the fruit at maturity; fruit 1.7 mm. long, 1 mm. 

 wide, elliptic, subobtuse. 



Autumnal phase more or less spreading, rather freely branching from all the nodes, the 

 branches appressed or narrowly ascending, the later branchlets somewhat fascicled, the stiff 



blades not greatly reduced, overtopping the numerous reduced panicles. 



Type locality: Wildwood, New Jersey. 

 Distribution: Massachusetts to South Carolina. 



Illustrations: Bull. U. S. Dept. Agr. Agrost. 17: /. 374; Contr. U. S. Nat. Herb. 15: /. 261; 

 Britt. & Brown, 111. Fl. 3: App. /. 267e; ed. 2. /. 363, f. 366b. 



157. Panicum wilmingtonense Ashe, Jour. Elisha Mitchell Soc. 16: 



86. 1900. 



Panicum alabamense Ashe, Bull. N. Car. Exp. Sta. 175: 116. 1900, Not P. alabamense Trin. 1854. 



Vernal phase bluish-green; culms solitary in small tufts, slender, erect from an ascending 



base, 20-40 cm. high, pilose with soft, ascending hairs, the nodes pubescent with short, reflexed 



