POACEAE 79 
98. P. lancearium Trin. Stem 20-50 em. tall: leaf-blades 2-6 em. long, 3-7 
E. wide, puberulent or nearly glabrous cun strongly ciliate towards 
base: panicle 3-6 em. long: spikelets puberulent or glabrous. Autumn 
mis geniculate bien branching from the mi dle nodes. [P. Nashianum 
Seribn.|—Low sandy woods, prairies, and | i x aa Coastal Plain and rarely 
Blue Ridge, Fla. to Miss. and Va. —(W , C. A.) 
99. P. patulum (Seribn. & Merr.) A. Hitche. Resembling P. lancearium, but 
more lax. Autumnal phase more freely branching, often forming Are mats. 
zov moist oer pinelands and ‘hammocks, Coastal Plain, Fla. La. 
and Va. 
100. P. malacophyllum nico n slender, 25-7 0 em. long, genieulate, 
SPIE or T ligules 1-1.5 mm. long: leaf-blades 6-12 mm. wide: 
ine e 3— M. . long: spikelets Lg rds -pilose. Autumnal phase ‘spreading, 
| em ires hing from u and middle nodes sd woods, various 
provinees N of Coastal Plain Tex. i Okla. and Ten 
101. P. Ravenelii Scribn. & Merr. Stem erect, 30-70 em. tall: es 3—4 
mm. long: leaf-blades 1-2 em. wide, glabrous on upper surface: panicle 7-12 
em. long: spikelets Eod Pein pubescent. Autumnal phase seed 
the branches numer mit.—Sandy woods, pinelands, and marshes, 
various provinces, Fla. a Tex. Mo., and Del. 
102. P. oligosanthes Schult. Stem bobo. 35-80 em. tall: ligules 1-2 mm. 
long: leaf-blades stiffly spreading o ascendin ing, 5-8 mm. wide, glabrous on 
upper surface: panicle 6—12 cm. us spikelets 3.5—4 mm. long, sparsely 
hirsute. Autumnal phase topheavy-prostrate, the short branches aggregate at 
the summit.—Sandy moist woods, dunes, and bottoms, Coastal Plain, Fla. to 
Tex., Okla., and N. J., and Great Lake Lowland, N In d. 
103. P. ig ar Nash. Stem erect, rather stiff, 20—50 em. tall: ligules 
about 1 mm. long: leaf-blades 6-12 mm. wide, glabrous on the upper o 
panicle 4— 8 em. long: spikelets P, moo to nearly glabro Au- 
tumnal phase much-branch ed at summit, the blades not meer d reduc od. —Dry 
prairies, sandy soil, woods, prairies, euis and fields, various provinces, 
Tenn. to Ariz., Wash., Ont., Me., and Md. 
x P. scoparium Lam. Stem 80-130 em. tall, stout, erect or o 
sually ieu ders at base, the nodes villous with reflexed hairs, a glabro 
viscid 1 ing below: a sheaths glabrous and visc id on the back toward the 
ummit: leaf-blades 2 s mm. wi long-acuminate: paniele.8—15 em. long: 
puce turgid, abou mm. long, Di -pubescent. Autumnal phas 
ua or spreading, freely PE the ultimate branches in fascicles i 
the es. [P. pubescens L m. j— — Wet soil, prairies, swamps, woods, and thick- 
ets, Coastal Plain and adj. D uc. Fla. to Tex., Okla., and Mass.—(W. I.) 
P. aculeatum H. & C. Stems in large clumps, 70—100 em. tall, harshly 
pubesent a Vae zi eun Luo ied -hispid with stiff, sharp hairs: epa 
ong 
ie wide, involute- DUE panicle 8-12 e 
E m pt m. lont d y pubescent. Autumnal phase bags pus 
the middle nodes.—Swampy nod Coastal Plain, N. C. to Long Id., N. Y. 
106. P. scabriusculum Ell. Stem 1-1.5 m. tall, oo at least below the 
nodes, sometimes puberulent: leaf-blades 15-25 em. long, 9-12 mm. wide, gla- 
ede or € often pubescent beneath: panicle pum em. long: spikelets 
long, glabrous or obseurely puberulent, the se g 
ay ane much larger than the fruit. A phase erect, branching 
it. ut 
from the middle and upper nodes, finally bearing fascicled Liban and 
forming dense oblong masses along the upper part of the primary s 
