74 POACEAE 
foliage, the pags n ur ae clusters ru the nodes: s pues 
numerous, 1-3 ide, soon involute. 
ground, diet ey prairies, a pb Coastal Plain, Fla. m Tex. ond 
Va—(W. I.) 
P. raul cda di ie pu uds — usually purplish, 40-100 em. 
tall: i blades 8—12 e ong, 8—12 wide e, glabrous or pA: B rni 
8—10 cm. long, the flexuous ‘ranches spreading: spikelets about 2.5 . long. 
A und phase erect or dec t, branching rather igre on the mid- 
dle nodes.—Low moist RU posten Plain, N. C. 2 Xs 
53. P. Clutei Aus ie gie PF. mattamuskeetense, but more nearly gla- 
brous, only the lowermost nodes, leaf-sheaths and blades velvety: spikelets 
slightly smaller.—Moist acid soils, "Coastal Plain and New England Coast, N. C. 
o Mas 
54. P. lucidum Ashe. Plant glabrous, at first erect and resembling those of 
. dichotomum, the weak stem soon deeumbent: spikelets 2 mm. long, glabrous 
or rarely pubescent. Autumnal phase repeatedly branching, forming large 
vine-like ste 
clumps or i 
divergent, not fascicled.—Wet woods, no and sphagnum bogs, S 
Plain and New m. x Coast, Fla. to Tex. and Mass., and Great Lake Low 
land, N Ind.—(W. I.) 
55. P. sphagnicola Nash. Plant glabrous: stem slender, erect or reclining, 
50—100 hun tall: spikelets 2.5 mm. long, glabrous or puber erulent toward the 
apex umnal phase decumbent or finally prostrate- spreading, igen) 
[eMe pies all the nodes.—Edges of E i swamps and in sphagnu 
bogs, Coastal Plain, Fla. and Ga. 
.56. P. geni dum Haek. Plant glabrous: stem slender, 50—75 cm. tall: wt 
blades 5-8 em. long, 4-7 mm. wide, usually purplish-beneath: panicle 3-7 e 
long: Bs turgid, strongly nerved.—Marshes, prairies, and swampy ODDS 
Coastal Plain, Fla. to Miss. and N. J.—(W. I.) 
57. P. roanokense Ashe. Resembles P. caerulescens: stem 50-100 em. tall: 
panicle more spreading: spikelets turgid, strongly nerved, purple- hen at 
base. [P. curtwaginum Ashe]—Open s swampy woods, Coastal Plain, Fla. to 
Tex. and Va.—(W. I.) 
58. P. yadkinense Ashe. Plant glabrous, in a small tuft: stems erect and 
as muchas 100 em. tall: leaf-blades 8-11 mm. wide: panicle 10-12 em. long: 
spikelets about 25 mm. long, the second glume and sterile lemma pointe 
: i ond the fruit. Autumnal phase phe or leaning, loosely branched from 
middle nodes.—Moist woods and swamps, Coastal Plain and rarely adj. 
b iig Ga. to La., Ill., and Pa.—(Mez.) 
59. P. dichotomum L. Plant glabrous: deem erect from E knotted crown, 
a em. tall: leaf- oars d 5—11 . long, 4— wide: panicle 
4—9 em. long: spikelets ong, glabrous, rarely pubescent Dry sterile 
Wood. various prance Ta e Tex., Mich., N. B. 
60. P. barbulatum Michx. Resembling P. dichotomum: differs in having 
pubescent lower nodes and in the diffusely branched autumnal phase, forming 
large reclining bunches, the pene branehes recurved, the numerous flat leaf- 
blades horizontally spreading. sd woods, pinelands, and fields, various 
provinces, Ga. to Tex., Mich., and Mas 
