92 POACEAE 
wide, linear: panicle 6-14 cm. long, its branches very long, naked below, erect to widely 
spreading : spikelets at the end of the branches, 3-4 mm. long and 1.5-1.8 mm. wide, 
elliptic, acute, densely papillose-hirsute with ascending hairs. [P. sparsiflorum Vasey. ] 
In wet soil, the Indian Territory to Mississippi and Texas. Fall. 
15. Panicum capillare L. Stems 3-6 dm. tall, simple, or branched near the base, 
stout: leaf-sheaths usually purplish, papillose-hirsute ; blades 1.5-8 dm. long, 6-16 mm. 
wide, pubescent : primary panicle 2-3.5 dm. long, the larger branches 1.5-2.5 dm. long, 
the lateral panicles smaller: spikelets very numerous, 2-2.5 mm. long, lanceolate, acumi- 
nate, glabrous. 
In dry soil, and common in cultivated ground as a weed, Nova Scotia to Minnesota, Florida and 
Texas. Summer and fall. WITCH Grass. TUMBLE WEED. 
16. Panicum Philadélphicum Bernh. Stems erect, 2-6 dm. tall, slender, somewhat 
branched at the base: leaf-sheaths hirsute ; blades 5-10 em. long, 2-6 mm. wide, erect, 
pubescent : panicle 10-23 em. long, its lower branches spreading or ascending : spikelets 
about 1.5 mm. long, elliptic, acute, glabrous. ; 
In dry woods and thickets, New Brunswick to Georgia and Missouri. Summer and fall. 
17. Panicum Gattingeri Nash. Annual. Stems commonly slender, finally branched 
and often prostrate at the base, 3-6 dm. long: leaf-sheaths papillose-hirsute ; blades 1.5 
dm. long or less, 4-8 mm. wide, pubescent, erect: primary panicle 1-1.5 dm. long, its 
branches ascending, the larger ones usually 5-7 cm. long, the lateral panicles smaller : 
spikelets about 2 mm. long, elliptic, acute, glabrous. 
In poor soil, Connecticut and New Jersey to North Carolina and Tennessee; alsoin Missouri. Fall. 
18. Panicum fléxile (Gattinger) Scribn. Stems erect, 1.5-4.5 dm. tall, slender: 
leaf-sheaths papillose-hirsute ; blades 10-23 cm. long, 4-6 mm. wide, erect, long-acumi- 
nate, pubescent: panicle 1-2.5 dm. long: spikelets about 3 mm. long, much shorter than 
the pedicels, acuminate, glabrous. 
In moist or dry soil, Pennsylvania to Tennessee and Missouri. Summer and fall. 
19. Panicum proliferum Lam. Stems at first erect, 3-6 dm. tall, simple, later de- 
cumbent, 1-1.5 m. long, branched at all the upper nodes: leaf-sheaths loose, glabrous, 
somewhat flattened ; blades 1.5-6 dm. long, 4-20 mm. wide, long-acuminate: panicle 
pyramidal, 1-4 dm. long: spikelets 2-3 mm. long, lanceolate, acute, glabrous. 
In wet soil, Maine to Pennsylvania, Nebraska, Florida and Texas. Summer and fall. 
20. Panicum miliaceum L. Stems erect or decumbent, rather stout, 3 dm. tall or 
more: leaf-sheaths papillose-hirsute ; blades 1-2.5 dm. long, 8-25 mm. wide, pubescent : 
panicle rather dense, 1-2.5 dm. long, its branches erect or ascending : spikelets 5 mm. long, 
acuminate, glabrous. 
In waste places, Maine to Delaware, Pennsylvania, and Georgia, and in Nebraska. Introduced 
from the Old World. Summer and fall. MILLET. 
21. Panicum stenódes Griseb.  Glabrous, or the lower leaf-sheaths sometimes 
pubescent. Stems tufted, wiry, erect, 3-8 dm. tall, finally branched : leaf-blades erect, 
involute when dry, 1.5 dm. long or less, 1-1.5 mm. wide: panicle narrow, 3-15 cm. long, 
its branches erect, the pedicels often with a few bristles at the base: spikelets about 2.5 
mm. long, lanceolate, acute, glabrous. 
In moist and sandy pine lands, Florida to Texas. Alsoin the West Indies. Spring to fall. 
22. Panicum diffüsum Sw. Glabrous. Stems tufted, erect, 2-4 dm. tall, rather 
slender: leaf-blades linear, narrowed toward the base, long-acuminate, 2.5 dm. long or 
less, 3-4 mm. wide, erect: panicle 8-15 em. long, its branches ascending: spikelets gla- 
brous, lanceolate, acute, about 2 mm. long. 
In sandy soil, southern Texas and Mexico. Spring to fall. 
23. Panicum Hállii Vasey. Stems tufted, branching from the base, glabrous : leaf- 
sheaths glabrous ; blades erect, linear, long-acuminate, 5-15 em. long, 2-4 mm. wide, gla- 
brous: panicle 1-2 dm. long, its branches long and ascending : spikelets about 2.5 mm. 
long, ovoid, acute, glabrous. 
In dry soil, Texas. Spring and summer. 
24. Panicum fílipes Scribn. Glabrous. Stems erect, 8-10 dm. tall: leaf-blades 
linear, long-acuminate, lighter above, 3-4 dm. long, 5-8 mm. wide: panicle 1.5-2.5 dm. 
long, effuse, its slender branches spreading: spikelets glabrous, ovate-lanceolate, about 
2.5 mm. long, acute, the first scale large and acute, a little more than 3 as long as the 
spikelet. 
In dry soil, southern Texas. Spring and summer. 
25. Panicum cognàtum Schult. Stems tufted, 3-6 dm. long, at first erect, finally 
prostrate and branched at the base, glabrous: leaf-sheaths usually longer than the inter- 
nodes, glabrous, or more or less pubescent with very long weak hairs; blades erect, linear 
