POACEAE 99 
79. Panicum leucóthrix Nash. A villous densely tufted perennial. Stems 3-6 
dm. tall, erect, finally much branched : primary leaves 3-5 ; sheaths usually less than 4 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 em. 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. 
In usually dry sandy soil, southern New Jersey 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 nítidum Lam. Stems 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 em. long, broadly ovoid, its branches ascending : 
spikelets about 1.5 mm. long and 0.8 mm. wide, obovoid, densely pubescent with short 
spreading hairs. 
In dry soil, New York to Georgia. Summer. 
82. Panicum Tennesseénse 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 muc 
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. Wilmingtonense 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 with 
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 hairs, 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 lanuginósum 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 branched, a smooth ring below each barbed node : leaf-blades erect, lanceolate, 4-13 
em. 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 Thurówii 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, 
elliptie, pubescent with spreading hairs. 
In dry soil, Texas. Summer. 
86. Panicum filicalme 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 Jong 
and copious: primary panicle long-exserted, 2-3 cm. long: spikelets broadly obovoid to 
