84 FLORA. 



wide, the uppermost leaf the longest, and often extending beyond the panicle; pri- 

 mary panicle loose and open, 3.75-10 cm. long, its branches ascending; spikelets 

 2-2.5 mm - l n g> obtuse or acutish, pubescent with spreading hairs. Dry soil, es- 

 pecially hillsides, N. Y. and N. J. to Mo. (P. linear if olitim Scribn.) 



17. Panicum Werneri Scribn. WERNER'S PANICUM. (I. F. f. 268b.) Smooth 

 and glabrous, light green. Culms tufted, erect, slender, simple or later sparingly 

 branched, 2.5-4.5 dm. tall; leaves erect, elongated, linear, acuminate, 5-10 cm. 

 long, 3-5 mm. wide, panicle loose and open, 6.2-8.7 cm - l n g i ts branches as- 

 cending; spikelets about 2 mm. long on longer hispidulous pedicels, oval, minutely 

 and sparsely pubescent, the first scale orbicular, about one-quarter as long 

 as the spikelet, I -nerved, the second and third scales 7-nerved, the fourth scale 

 oval, slightly apiculate. Dry knolls in swamps, N. Y. and Ohio. June-July. 



1 8. Panicum Bickneflii Nash. BICKNELL'S PANICUM. (I. F. f. 268c.) 

 Culms erect or decumbent at the base, slender, 24 dm. tall, the lower internodes 

 puberulent. Sheaths ciliate on the margins, the lowermost pubescent; leaves 

 elongated, erect, linear-lanceolate, acuminate, narrowed toward the ciliate base, 

 primary leaves 7.5-17.5 cm. long, 5-10 mm. wide; primary panicle 6-7.5 cm - l n g 

 its branches ascending, secondary panicles smaller, with appressed branches ; spike- 

 lets obovate or oval, 2.5-3 mm. long, pubescent with short, spreading hairs, the first 

 scale I -nerved, the second and third scales Q-nerved. Dry wooded hills, N. Y. 

 and Penn. July-Aug. 



19. Panicum laxiflorum Lam. LAX-FLOWERED PANICUM. (I. F. f. 262.) 

 Culms erect, 2-4 dm. tall, simple, pubescent, or glabrate. Sheaths shorter than 

 the internodes, hirsute; leaves 6.25-12.5 cm. long, 4-10 mm. wide, erect, generally 

 narrowed at base, long-acuminate, pubescent or glabrate; panicle 5-10 cm. long, 

 its axis and erect or spreading branches sometimes hirsute; spikelets about 2 mm. 

 long, ellipsoid or narrowly obovoid, strongly pubescent; first scale minute, 

 i-nerved; second and third about equal, g-nerved, very pubescent, as long as the 

 shining, obtuse, minutely apiculate fourth one; third scale usually with an empty 

 palet. Moist soil, Va. to Ky., south to Fla. June-Aug. 



20. Panicum neuranthum Griseb. NERVED PANICUM. (I. F. f. 26Qa.) 

 Culms tufted, slender, at length much branched, 3-7.5 dm. tall. Sheaths gla- 

 brous, or the lower pubescent; leaves smooth and glabrous, the primary erect, 

 acuminate, 2.5-10 cm. long, 2-5 mm. wide, those on the branches shorter, erect or 

 ascending, usually involute when dry, concealing the small secondary panicles; 

 primary panicle 2.5-10 cm. long, its branches at first erect, at length widely 

 spreading; spikelets numerous, broadly obovate, about 2 mm. long, densely pubes- 

 cent with short, spreading hairs, the second and third scales 7-nerved. Dry or 

 moist soil along the coast, Va. to Fla. and La. Also in Cuba. June-Oct. 



21. Panicum angustifolium Ell. NARROW-LEAVED PANICUM. (I. F. f. 269.) 

 Culms erect, 3-6 dm. tall, glabrous, at first simple, later profusely branched 

 above. Leaves elongated, 2-6 mm. wide, narrowed to the base, firm, glabrous, 

 those of the culm distant, those of the branches shorter and crowded; primary 

 panicle long-exserted, 2.5-7.5 cm. long, its branches ascending or erect; lateral 

 panicles smaller, shorter than the leaves; spikelets few, about 2.5 mm. long, 

 elliptic to obovoid; first scale one-fourth to one-third as long as the spikelet; 

 second and third oval, Q-nerved, pubescent; fourth oval, minutely pubescent at 

 the apex. Dry soil, N. Car. to Mo., south to Fla. and Tex. June-Aug. 



22 Panicum Brlttoni Nash. BRITTON'S PANICUM. (I. F. f. 263a.) Smooth 

 and glabrous. Culms coarsely striate, not branched, tufted, slender, erect, ri^id, 

 1-2 dm. tall; leaves longer than the sheaths, those on the culm three in number, 

 the middle one the longest, 1.25-3.1 cm. long, 1.5-3 mm. wide, erect, acuminate, 

 5~7-nerved; panicle 1.8-3.1 cm. long, its branches spreading or ascending; spike- 

 lets one-half as long as the pedicels or less, obovoid, obtuse, 1.5 mm. long, the first 

 scale one-third as long as the spikelet, the second and third scales 7-nerved, densely 

 pubescent with spreading hairs. Moist sand in the pine barrens of southern N. J. 

 May-June. 



23. Panicum dichotomum L. FORKED PANICUM. (I. F. f. 264.) Smooth 

 and glabrous, or the lower nodes barbed. Culms erect, 1.5-6 dm. tall, at first 

 simple, later profusely dichotomously branched at about the middle. Leaves light 

 green, widely spreading, generally much narrowed toward the base, the primary 



