Part 3, 1915] POAC3A3 



245 



sometimes 25 cm. long, pubescent on the lower surface; panicles smaller and narrower, the 

 branches erect, hence appearing more densely flowered; spikelets 2.7-3.2 mm. long, 1.6-1.7 

 mm. wide, oval, blunt, sparingly pilose; first glume one fourth to one third the length of the 

 spikelet, acute or obtuse ; second glume and sterile lemma equal, obtuse, not extending beyond 

 the fruit, strongly 7-9-nerved; fruit 2.4 mm. long, 1.5-1.6 mm. wide, obovate-oval, rounded 

 and minutely umbonate at the summit. 



Autumnal phase with secondary panicles usually more numerous than in P. depauperatum 

 and sometimes produced from the second node. 



Type locality: Oklahoma. 



Distribution: Manitoba to Texas. 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 138; Britt. & Brown, 111. PI. ed. 2. /. 330. 



96. Panicum linearif olium Scribn. ; Nash, in Britt. & Brown, 



111. Fl. 3: 500. 1898. 



Vernal phase light-green, in dense tufts, often surrounded by the withered, persistent, 

 more or less curled leaves of the previous year, the culms readily separating, 20-45 cm. high, 

 very slender, erect, spreading or almost drooping at the summit, glabrous, minutely puberulent 

 or rarely pilose; leaf -sheaths usually equaling or exceeding the internodes, sparsely to densely 

 papillose-pilose, the papillae often obscure; blades elongate and erect, usually overtopping the 

 panicles until maturity, 10-35 cm. long (the lower shorter), 2-4 mm. wide, scabrous on both 

 surfaces or often pubescent on the lower, rarely on the upper surface, usually ciliate near the 

 base with long hairs; panicles finally long-exserted, 5-10 cm. long, half to two thirds as wide, 

 rather few-flowered, the scabrous, flexuous branches remote, ascending; spikelets 2.2-2.7 mm. 

 long, 1.3-1.5 mm. wide, oblong-elliptic, obtuse, sparsely pilose with weak, spreading hairs; 

 first glume one fourth to one third the length of the spikelet, obtuse, or pointed by the inrolling 

 of the margins ; second glume and sterile lemma equal and equaling the fruit at maturity ; fruit 

 2-2.1 mm. long, 1.2 mm. wide, oval, obscurely umbonate at the summit. 



Autumnal phase similar, the reduced secondary panicles produced on short basal branches 



mostly concealed in the tuft of basal leaves. 



Typs locality : Washington, District of Columbia. 

 Distribution: Maine to Minnesota, and south to Georgia and Texas. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 11: pi. 1; 17: /. 384 (as P. Enslini); Contr. 

 U. S. Nat. Herb. 15: /. 140; Britt. & Brown, 111. Fl. 3: App./. 268a; ed. 2./. 331. 



97. Panicum Werneri Scribn. ; Nash, in Britt. & Brown, 



111. Fl. 3 : 501. 1898. 



Panicum delawarense Ashe, Bull. N. Car. Exp. Sta. 175: 116. 1900. 



Vernal phase similar to that of P. linearif olium, typical specimens differing as follows: 



A- 



culms stiff er; nodes usually sparingly pilose; leaf -sheaths glabrous, often shorter than the 



internodes; blades firmer, shorter and wider, 15 cm. long or less, the lower culm-blades 3.5-6 



cm. long, 3-6 mm. wide, a few long hairs at the rounded base, scabrous on both surfaces, not 



pubescent; spikelets 2.1-2.4 mm. long, 1.2-1.3 mm. wide, nearly or quite glabrous. 



Autumnal phase similar to the vernal, remaining simple or late in the season bearing 



simple branches from the lower, rarely from the basal, nodes. 



Type locality: Ohio. 



Distribution: Maine to Minnesota, and south to Ohio and Texas. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 364; Contr. U. S. Nat. Herb. IS: /. 142; 

 Britt. & Brown, 111. Fl. 3: App./. 268b; ed. 2./. 332. 



Panicum 



1797. 



Panicum pyriforme Nash, Bull. Torrey Club 26: 579. 1899. 



Panicum aureum Muni.; Scribn. & Merr. Circ. U. S. Dep. Agr. Agrost. 27: 4, as synonym. 1900. 



Vernal phase with slender culms 20-60 cm. high, erect, or the lower nodes often geniculate, 

 glabrous; nodes bearded with reflexed hairs; leaf-sheaths shorter than the internodes, conspicu- 

 ously retrorsely pilose; blades mostly 10-18 cm. long, 7-12 mm. wide, acuminate, narrowed 

 toward the base, glabrous on both surfaces and on the margins, or sparsely ciliate; panicles 

 long-exserted, but sometimes equaled by the long upper blades, 8-12 cm. long, nearly as wide, 

 lax, few-flowered, the branches flexuous, spreading, the lower often deflexed; spikelets 2.2-2.3 



