POACEAE 99 



79. Panicum leucothrix Nash. A villous densely tufted perennial. Stems 3-6 

 dm. tall, erect, tinally much branched : primary leaves 3-5 ; sheaths usually less than i as 

 long as the internodes, the pubescence ascending ; blades erect, rather firm, lanceolate, 

 densely and softly pubescent on the lower surface with short spreading hairs, glabrous 

 above, 3-5 cm. long, 4-6 mm. wide : primary panicle usually 3-5 cm. long, rarely larger 

 or smaller, broadly ovate, its branches ascending : spikelets about 1.2 mm. long and about 

 0.6 mm. wide, oval, pubescent with short spreading hairs. 



Ill usually dry sandy soil, southern New .Tersey to Florida and Texas. Spring and summer. 



80. Panicum parvispiculum Nash. A much tufted perennial. Stems glabrous, or 

 more or less appressed-pubescent below, erect, finally branched : leaves 4 or 5 ; sheaths 

 shorter than the internodes, glabrous, or the lower ones more or less pubescent ; blades 

 erect or ascending, firm, lanceolate, acuminate, the primary ones 3-10 cm. long, 2-7 mm. 

 wide, minutely but densely pubescent on the lower surface : panicle 6-10 cm. long, broadly 

 ovate, its branches ascending : spikelets 1.3 mm. long and about 0.8 mm. wide, oval, 

 densely pubescent with spreading hairs. 



In dry soil, North Carolina to Florida and Mississippi. Spring and summer. 



81. Panicum nitidum Lam. vStems tufted, 4-8 dm. tall, glabrous, finally much 

 branched : leaves 4 or 5 ; sheaths glabrous, ciliate on the margin with long hairs ; blades 

 erect, glabrous, or the lower surface sometimes minutely pubescent with short hairs, ciliate 

 at the base, the primary ones 2-8 cm. long, 3-8 mm. wide, lanceolate, firm, the blades on 

 the branches much smaller : panicle 3-8 cm. long, broadly ovoid, its branches ascending : 

 spikelets about 1.5 mm. long and 0.8 mm. wide, obovoid, dejisely pubescent with short 

 spreading hairs. 



In dry soil. New York to Georgia. Summer. 



82. Panicum Tennesse6nse Ashe. Stems tufted, 4-6 dm. tall, rather weak and as- 

 cending, papillose-hirsute with long spreading hairs, finally much branched and prostrate 

 and forming broad mats : leaves 4 or 5 ; sheaths densely papillose-hirsute with long 

 spreading hairs ; blades ascending, lanceolate, the lower surface densely and softly pubes- 

 cent with short hairs, the upper surface with scattered hairs and those at the base very 

 long, the primary blades 4-10 cm. long, 5-10 mm. wide, those on the branches much 

 shorter and spreading with the upper surface nearly glabrous : panicle 7-10 cm. long, 

 ovoid, its branches ascending : spikelets 1.7-2 mm. long, 0.8-0.9 mm. wide, elliptic or 

 obovoid, strongly pubescent with long spreading hairs. [P. \Vibriin(ftonense Ashe.] 



In woods. New York and Illinois to Tennessee and Florida. Summer and fall. 



83. Panicum ciliosum Nash. Stems tufted, 3-5 dm. tall, papillose-hirsute with 

 spreading hairs, finally much branched : leaves 4 or 5 ; sheaths densely hirsute Avith 

 spreading hairs, hirsute on the margins ; blades erect or ascending, narrowed toward the 

 base, ciliate on the margins, glabrous above, the lower surface densely pubescent between 

 the nerves with short spreading hairs : panicle about 8 cm. long, broadly ovoid, its axis 

 pubescent with short haii-s, the branches spreading : spikelets a trifle less than 2 mm. long 

 and about 0.9 mm. wide, elliptic, strongly pubescent with rather long spreading hairs. 



In dry soil, Mississippi. Summer and fall. 



84. Panicum lanuginosum Ell. Stems and leaves villous with spreading hairs, those 

 on the blades and upper part of the stems shorter. Stems leafy, tufted, 3-8 dm. tall, erect, 

 finally liranched, a smooth ring below each barbed node : leaf-blades erect, lanceolate, 4-13 

 cm. long, 4-9 mm. wide : panicle ovoid, 4-10 cm. long, the axis pubescent, the branches 

 ascending: spikelets numerous, broadly obovoid, about 1.5 mm. long and 0.8 mm. wide, 

 densely pubescent with spreading hairs. 



In dry sandy soil, southern New Jersey to Florida and Alabama. Summer. 



85. Panicum Thuro'wii Scribn. & Smith. Stems tufted, 4-6 dm. tall, at first erect 

 and simple, finally branched, papillose-hirsute below with long hairs, the pubescence above 

 softer: leaves 4 or 5 ; sheaths densely papillose-hirsute with long spreading hairs; blades 

 erect or ascending, densely long-villous on the lower surface, the upper surface pubescent 

 with long stiff' spreading hairs, or sometimes nearly glabrous : panicle 6-9 cm. long, 

 broadly ovoid, its branches ascending : spikelets about 1.8 mm. long and 0.8 mm. wide, 

 ellijitic, pubescent with spreading hairs. 



In dry soil, Texas. Summer. 



86. Panicum filiciilme Ashe. Stems densely tufted, slender, finally much branched, 

 2-3 dm. tall, minutely pubescent above : leaf-sheaths strongly hirsute with very long hairs ; 

 blades erect, the primary ones 1.5-3 cm. long, 2-4 mm. wide, papillose-pubescent on both 

 surfaces, or sometimes glabrous beneath, the hairs on the upper surface exceedingly long 

 and copious : primary panicle long-exserted, 2-3 cm. long: spikelets broadly obovoid to 



