94 POACEAE 
base: panicle narrow, 1-2 dm. long, its slender branches erect : spikelets numerous, about 
2.5mm. long, lanceolate, often with 1-3 bristles at the base, glabrous. 
In pine lands, southern peninsular Florida. Summer and fall. 
36. Panicum stipitatum Nash. Stems erect, 9-15 dm. tall, much branched : leaf- 
blades 3 dm. long or more, 4-8 mm. wide, acuminate, rough: panicle pyramidal, 1-3 dm. 
long, its primary branches spreading or ascending: spikelets about 2.5 mm. long, acumi- 
nate, the fourth scale on a delicate stalk about 0.5 mm. long. 
à m moist soil, New Jersey and Pennsylvania to Kentucky, Tennessee and Georgia. Summer 
and fall. 
37. Panicum rostratum Muhl. Stems erect, 4-15 dm. tall, branched: leaf-sheaths 
glabrous, or pubescent ; blades 3 dm. long or more, 4-10 mm. wide : panicles 1.5-3 dm. 
long, its branches erect to spreading : spikelets 2.5-3.5 mm. long, lanceolate, acuminate, 
curved at the apex. 
In moist soil, southern New York and New Jersey to Missouri and the Indian Territory, Florida 
and Texas. Summer and fall. 
38. Panicum linearifòlium Scribn. Stems tufted, slender, erect, glabrous, simple, 
1.5-4 dm. tall: leaf-sheaths glabrous or hirsute ; blades glabrous or pubescent, elongated, 
7-25 em. long, 2-4 mm. wide, the uppermost blade the longest and often extending beyond 
the panicle: primary panicle loose and open, 4-10 em. long, its branches ascending : spike- 
lets 2-2.5 mm. long, obtuse or acutish, pubescent with spreading hairs. 
In dry soil, especially on hillsides, New York and New Jersey to Missouri and the Indian Terri- 
tory. Summer and fall. 
39. Panicum perlóngum Nash. A tufted pubescent perennial. Stems 2-4 dm. 
tall, simple, glabrous, or sparingly pubescent, the nodes barbed, finally with short basal 
stems : leaves 1 or 2; sheaths hirsute with long ascending hairs ; blades elongated, linear, 
erect, papillose-hispid beneath, 2-3 mm. wide, the upper blade commonly 8-14 cm. long: 
panicle much exserted, generally extending beyond the apex of the upper leaf-blade, 4—6 
cm. long, its branches erect or erect-ascending : spikelets about 3.25 mm. long and 1.5-1.75 
mm. wide, pubescent with a few scattered long hairs. 
On prairies and in dry soil, Illinois to South Dakota and the Indian Territory. Spring and sum- 
mer. 
40. Panicum depauperàtum Muhl. Stems erect, 3 dm. tall or less, simple: leaf- 
sheaths glabrous to hirsute ; blades 8-15 cm. long, elongated, 1-4 mm. wide, the upper one 
sometimes much exceeding the panicle: primary panicle much exserted, 2-8 cm. long, 
usually linear, its branches erect or nearly so: spikelets 3-4 mm. long, glabrous, acute. 
In dry places, Maine to Minnesota, Florida and Texas. Summer and fall. 
41. Panicum glabrifólium Nash. Glabrous and shining. Stems tufted, 1.5-4 dm. tall, 
erect, rigid, slender, leafy, finally much branched : leaf-sheaths with a tuft of hairs on each 
margin at the apex ; blades narrowly linear, erect, rigid, thickish, long-acuminate, nar- 
rowed toward the base, those on the shoots 1.5 dm. long or less, 3-4 mm. wide, those on 
the flowering stems 3-9 cm. long, 1-3 mm. wide : panicle ovate, 4-6 cm. long, its branches 
spreading or somewhat ascending : spikelets 1.3-1.5 mm. long and 0.7 mm. wide, obovoid. 
In low pine lands, Florida. Summer. 
42. Panicum strigdsum Muhl. A tufted densely papillose-hirsute perennial, the 
pubescence spreading. Stems 2-4 dm. tall, simple: leaves 2 or 3; sheaths much shorter 
than the internodes ; blades erect, lanceolate, 2-7 cm. long, 3-10 mm. wide: panicle much 
exserted, 5-8 cm. long, broadly ovate, its branches spreading or somewhat ascending : 
spikelets 1.3-1.5 mm. long and about 0.8 mm. wide, oval, glabrous. 
In dry or moist pine lands, North Carolina and Tennessee to Florida. Spring and summer. 
43. Panicum polycaülon Nash. Yellowish green. Stems tufted, naked above, 2 
dm. tall or less, erect, simple, finally branched : leaf-sheaths ciliate on the margin ; blades 
erect or ascending, narrowly oblong-lanceolate, 2-7 cm. long, 2-8 mm. wide, ciliate on the 
margin : panicle broadly ovate, 3 cm. long or less, its branches spreading or ascending, the 
main axis and generally the branches sparingly pilose: spikelets about 1.5 mm. long and 
0.8 mm. wide, obovoid, obtuse, glabrous. 
In low pine lands, Florida to Mississippi. Also in Cuba. Summer. : 
44. Panicum ciliàtum Ell. Stems tufted, 1-2.5 dm. tall, simple, glabrous, the axis 
of the panicle and its branches hirsute: leaves usually 2; sheaths shorter than the inter- 
nodes ; blades spreading or ascending, glabrous on both surfaces, conspicuously ciliate on 
the margins, acute at the apex, somewhat cordate at the base, narrowly elliptic, linear or 
lanceolate, usually 2-6 cm. long and 5-10 mm. wide, rarely larger: panicle 3-5 cm. long; 
broadly ovate, its branches ascending: spikelets 1.8-2 mm. long and about 1 mm. wide, 
elliptic, pubescent with short spreading hairs, rarely nearly glabrous, the first scale about 
4 as long as the spikelet. 
In sandy soil, North Carolina to Florida and Mississippi. Spring and summer. 
