HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 165 
of this group; first glume one-third to half the length of the spikelet; second glume 
and sterile lemma equal, faintly nerved; fruit 1.3 mm. long, 0.6 to 0.7 mm. wide, 
elliptic, subacute, not umbonate. 
Autumnal form a dense mat with panicles scarcely rising above the leaves. 
This species is variable as to pubescence. Some of the specimens from Cuba and 
Guatemala show only a few scattered hairs upon the surface of some of the blades, 
but these are conspicuously ciliate on the margin. 
DISTRIBUTION. 
Sandy woods, Virginia and Tennessee to Florida and Louisiana; also in Mexico, 
Guatemala, and Cuba. 
Viraria: Norfolk County, Kearney 1761. 
Nortu CarouNa: Roanoke Island, Chase 3244; Onslow County, Chase 3171; 
Wilmington, Hitchcock 1450, 
Kearney 282. 
Soutu CarouNna: Aiken, Ravenel. 
Froripa: Jacksonville, Curtiss 
3597*, 4031; Washington 
County, Combs 567, 584. 
TENNESSEE: White Cliff Springs, 
Scribner in 1890 (Hitchcock 
Herb.). 
AtaBaMa: Cullman County, g- 
gert 21; Gateswood, Tracy 8422; 
Flomaton, Hitchcock 1043. F1a. 155.—Distribution of P. strigosum. 
MissrssipPr: Saratoga, T'racy 8402. 
LourstaNa: Lake Charles, Hitchcock 1162. 
Mexico: Minatitlan, J. G. Smith 555 (Hitchcock Herb.). 
GuaTemata: Secanquim, Pittier 257; Cuesta de Peixha, Pittier 1800. 
Cusa: El Guama, Palmer & Riley 213; without locality, Wright 3875 in part. 
Angustifolia.—Plants mostly dull grayish-green, cespitose; vernal culms erect or 
ascending from a spreading base, mostly 30 or 40 cm., rarely as much as 100 
cm, high, appressed-villous at base: or sometimes above, or rarely smooth 
even at base; ligules ciliate, less than 1 mm. long; blades narrow, ascending, 
usually firm and rigid, more or less striate with prominent nerves, and some- 
times longitudinally wrinkled besides, often ciliate at the base; spikelets 
attenuate at base, rather strongly 7-nerved, usually pubescent, the hairs aris- 
ing from bullate papilla; first glume narrow and sheathing at base. Autum- 
nal culms repeatedly branching, forming bushy crowns, these remaining 
erect or becoming decumbent or widely spreading; blades much reduced, 
often involute; a distinct rosette of basal leaves formed in the fall. Species 
of the Atlantic Coastal Plain. 
Nodes bearded; plants grayish-villous; autumnal blades flat. 
Spikelets 2 mm, long.........------------+++++++2+-+--- 92. P. chrysopst- 
difolium. 
Spikelets 2.5 to 2.8 mm, long...-...------------++-++-+-+- 93. P. consangut- 
neum. 
Nodes not bearded; plants villous only at base, or nearly gla- 
brous; autumnal blades involute or flat. 
Autumnal blades flat; lower panicle branches spreading 
or deflexed......-------.22220+- 22 -e eee eee eee eee 94. P. angustifolium. 
