GRAMINEAE. 85 



ones distant, 5—7.5 cm. long, 4-6 mm. wide, those of the branches 2.5 cm. long or 

 less, 1-2 mm. wide, sometimes involute; primary panicle usually long-exserted, 

 2.5-5 cm. long; branches lax, spreading, bearing few spikelets; secondary pani- 

 cles smaller, not exceeding the leaves, their branches with very few spikelets; 

 spikelets about 2 mm. long, ellipsoid, glabrous. In woodlands and thickets, N. Y. 

 to Ky., Mo. and southward. June-July. 



24. Panicum sphagnicola Nash. Sphagnum Panicum. (I. F. f. 264b.) 

 Culms slender, 4.5-9 dm. long, at length much elongated, dichotomously much 

 branched and declining. Leaves erect, smooth and glabrous on both surfaces, 

 lanceolate, the primary leaves 2.5-6.25 cm. long, 2-10 mm. wide, those on the 

 branches 3.75 cm. or less long; primary panicle loose and open, 3.75-7.5 cm. long, 

 its branches spreading or ascending; spikelets on elongated filiform pedicels, 

 1.75-2.5 mm. long, oval to obovoid, the scales glabrous or sparsely pubescent, the 

 first less than one-half as long as the spikelet, I -nerved, the second and third scales 

 7-nerved. Sphagnum bogs, D. C. and southern N. J. to Fla., west to Tex. June- 

 Sept. 



25. Panicum barbulatum Michx. Barbed Panicum. (I. F. f. 265.) Culms 

 at first simple, erect, 6-9 dm. tall, later profusely branched for their whole length, 

 9-12 dm. long, prostrate or leaning, the nodes strongly barbed. Leaves smooth 

 and glabrous, the primary ones 7.5-12.5 cm. long, about 1.25 cm. wide, widely 

 spreading, the lower ones usually reflexed, those of the branches 1.25-5 cm - l° n g> 

 2-4 mm. wide; primary panicle 7.5-12.5 cm. long, ovoid, its branches ascending, 

 rigid; secondary panicles smaller, lax, the branches bearing few spikelets; spike- 

 lets about 1.5 mm. long, ellipsoid, purple, glabrous. Moist soil, Conn, and N. Y. 

 to Tenn., south to Fla. and Tex. June- Aug. 



26. Panicum annul um Ashe. Culms single, sometimes somewhat tufted, 

 slender, 4-8 dm. tall, glabrous, the nodes densely barbed with long hairs. Sheaths, 

 especially the lower ones, pubescent ; leaves softly and densely pubescent on both 

 surfaces, spreading; panicle oblong, dense, 5-11 cm. long; spikelets nearly 2 mm. 

 long, elliptic, pubescent. In dry rocky woods, Md. (according to Ashe) to Ga. 

 June-July. 



27. Panicum EatoniNash. Eaton's Panicum. (I. F. f. 267c.) Smooth 

 and glabrous. Culms 4.5-10.5 dm. tall, erect, at length dichotomously branched and 

 swollen at the nodes; leaves erect, lanceolate, acuminate, 3. 75-10 cm. long, 3-10 

 mm. wide; panicle finally long-exserted, dense and contracted, 7.5-12.5 cm. long, 

 3.2 cm. or less broad, its branches erect-ascending ; spikelets oval, about 1.5 mm. 

 long, acutish, the first scale i-nerved, the second and third scales 7-nerved, densely 

 pubescent with spreading hairs. Along the coast, in damp or wet places, Me. to 

 N. J. May-Aug. 



28. Panicum boreale Nash. Northern Panicum. (I. F. f. 261.) Culms at 

 first erect and simple, 3-6 dm. tall, later decumbent and somewhat branched, 

 smooth and glabrous. Leaves 7.5-12.5 cm. long, 6-13 mm. wide, erect, sparsely 

 ciliate at the base, acuminate; panicle 5-10 cm. long, ovoid, its branches 2.5-5 

 cm. long, spreading or ascending ; spikelets 2 mm. long, about equalling the 

 pedicels, ellipsoid, somewhat pubescent; first scale ovate, obtuse; second and third 

 scales oblong-ovate, 7-nerved, pubescent, equalling the fourth, which is oval, acute, 

 and slightly more than 1.5 mm. long. Moist soil, Newf. and Ont. to N. Y., Vt. 

 and Minn. June -Aug. 



29. Panicum nltidum Lam. Shining Panicum. (I. F. f. 263.) Culms at 

 first simple, 3-4.5 dm. tall, later profusely dichotomously branched, 6-9 dm. long. 

 Sheaths glabrous to pubescent; leaves glabrous, the primary ones 2.5-7.5 cm. 

 long, 3-6 mm. wide, erect, those of the branches 1.25-2.5 cm. long, 2 mm. wide 

 or less; primary panicle long-exserted, 2.5-5 cm - l° n g> ovoid, those of the branches 

 smaller; spikelets about I mm. long, obovoid, pubescent, usually purple; second 

 and third scales broadly oval or orbicular, 7-nerved. Common in dry sandy soil, 

 N. E. to N. Car. June-Aug. 



30. Panicum Nashianum Scribn. Nash's Panicum. (I. F. f. 264a.) Culms 

 tufted, glabrous or puberulent, slender, 1.5-3.75 dm. tall, at length much branched. 

 Leaves erect or ascending, lanceolate, acuminate, smooth and glabrous, ciliate, at 

 least at the base, 1.8-5 cm - l° n g> 2_ 5 mm - wide, the leaves of the branches smaller; 

 primary panicle 2.5-5 cm. long, the branches widely spreading; spikelets about 2 



