GRAMINEAE. 8/ 



38. Panicum viscidum Ell. VELVETY PANICUM. (I. F. f. 266.) Culms 

 erect, 6-12 dm. tall, simple, or at length much branched above, villous. Sheaths 

 villous; leaves softly pubescent, those of the culm 10-17.5 cm. long, 10-16 mm. 

 wide, distant, those of the branches 2.5-6.25 cm. long, 410 mm. wide, crowded; 

 primary panicles 7.5-15 cm. long, ovoid, branches ascending; secondary panicles 

 much smaller; spikelets ovoid to oval, about 2.5 mm. long, pubescent; fourth scale 

 oval, apiculate, 2 mm. long. Moist soil, N. J. to Ind. and the Ind. Terr., south 

 to Fla. and Tex. Not viscid. June-Aug. 



39. Panicum Addisonii Nash. RIGID PANICUM. (I. F. f. 2676.) Culms 

 2.5-3.75 dm. tall, rigid, tufted, erect, or decumbent at the base, at length much 

 branched, the branches erect, pubescent with long, nearly appressed hairs. Sheaths 

 appressed-pubescent, at least the lower ones; leaves erect, lanceolate, thickish, 

 smooth and glabrous on both surfaces, acuminate, 2.5-7.5 cm. long, 3-6 mm. 

 wide; panicle ovoid to oblong, 1.8-5.6 cm. long, its branches spreading or ascend- 

 ing; spikelets obovoid, 2mm. long; second and third scales densely pubescent with 

 long, spreading hairs. Sandy soil, southern N. J. May-June. 



40. Panicum Commonsianum Ashe, COMMONS' PANICUM. Culms tufted, 

 erect, 2.5-5 dm. tall, densely appressed-hirsute below and puberulent above, or 

 rarely somewhat hirsute. Sheaths, especially the lower ones, appressed-hirsute; 

 leaves erect or nearly so, firm, glabrous on both surfaces, ciliate toward the base, 

 4-10 cm. long, 3-6 mm. wide; panicle open. 5-7 cm. long, broadly ovate, its 

 branches spreading; spikelets 2.5 mm. long, obovate, pubescent. On dry, 

 sandy ridges along the coast. Del. to N. Car. June July. 



41. Panicum Wilcoxianum Vasey. WILCOX'S PANICUM. (I. F. f. 260.) 

 Culms erect, 1.5-2.5 dm. tall, sparingly pubescent. Sheaths papillose-pubescent; 

 leaves 3.75-7.5 cm. long, less than 4 mm. wide, long-acuminate, strongly pubes- 

 cent with long hairs; panicle about 3.75 cm. long, oblong to ovoid, compact; 

 branches less than 2.5 cm. long, ascending, flexuous; spikelets about 2.5 mm. long, 

 ellipsoid; first scale about one-quarter as long as the spikelet; second and third 

 scales about equal, pubescent; fourth scale about as long as the third, obtuse. In 

 dry soil, Neb. (and Kans. ?). July-Aug. 



42. Panicum Liebergii (Vasey) Scribn. LIEBERG'S PANICUM. (I. F. f. 25ga.) 

 Culms erect, slender, glabrous, roughish, especially near the nodes. 3-6 dm. tall, 

 at length branched. Sheaths papillose-hirsute with spreading hairs; leaves erect 

 or ascending, lanceolate, 5-10 cm. long, 6-12 mm. wide, acuminate at the apex, 

 papillose-hispid beneath and sometimes sparingly so on the rough upper surface; 

 panicle oblong, 510 cm. long, its branches erect or ascending; spikelets 34 mm. 

 long, oval, the outer three scales papillose-hirsute with long, spreading hairs. Dry 

 soil, Ohio to Minn, and S. Dak., south to Mo. and Neb. June-July. 



43. Panicum Scribnerianum Nash. SCRIBNER'S PANICUM. (I. F. f. 259.) 

 Culms erect, 1.56 dm. tall, simple, or late in the season dichotomously branched 

 above, sparingly pubescent. Sheaths strongly papillose-hispid; leaves 5-10 cm. 

 long, 6-12 mm. wide, more or less spreading, smooth above, scabrous beneath; 

 panicles small, the primary one ovoid, 3.75-7.5 cm. long, the secondary ones much 

 smaller and more or less included; branches of the primary panicle spreading. 

 1.6-3.7 cm. long, often flexuous; spikelets turgid, obovoid, about 3 mm. long. In 

 dry or moist soil, Me. and Ont. to Minn., south to Va., Kans. and Ariz. June-Aug. 



44. Panicum xanthophysum A. Gray. SLENDER PANICUM. (I. F. f. 258.) 

 Culms erect, 3-6 dm. tall, simple. Sheaths sparingly papillose-hirsute; leaves 

 7.5-15 cm. long, 8-i8 mm. wide, long-acuminate, erect, smooth and glabrous; pan- 

 icle long-exserted, linear, 3.75-10 cm. long, its branches appressed; spikelets few, 

 about 3 mm. long, obovoid, pubescent or glabrate; first scale about one-half as long 

 as the nearly equal obtuse second and third; fourth scale indurated and shining, 

 elliptic or oval. Dry soil, Me. and Ont. to Manitoba, south to N. J. and Perm. 

 Plant light green, becoming yellowish in drying. June Aug. 



45. Panicum calliphyllum Ashe. Plant yellowish -green. Culms single or a 

 little tufted, simple. 4-5 dm. tall, minutely pubescent; sheaths glabrous, excepting 

 the ciliate margins; leaves ascending, 9-11 cm. long, 912 mm. wide, lanceo- 

 late, smooth and glabrous, ciliate at the base; panicle 6-9 cm. long, its ascending 

 scabrous branches 3-4 cm. long; spikelets few, 3 mm. long, elliptic, pubescent. In 

 dry soil, central N. Y. June-Aug. 



