POACEAE ! 71 
23. P. anceps Michx. Stem erect, rather stout, 50-100 em. tall: leaf-sheaths 
edi to ya pilose: blades '20 —50 cm x ng, 4—12 mm. wide, pilose above 
ard the base anicle 15—40 em. lon remote wr c 
ee spikelets somewhat curved, set o on the pedice [P.r 
iratum Muhl.]—Moist org soil, stream-banks, meadows, and ineladds ions 
provinees, Fla. to Tex, Kans., and N. J. 
24. P. rhizomatum H. & C. _Resenbling P. anceps, the stem more slender 
rootstocks more numerous: leaves shorter, somewhat ended at the base, the 
sheaths villous.—Moist sandy moods: pinelands and swamps, Coastal Plain, Fla. 
to Tex. and Va. 
25. P. longifolium Torr. Plant in dense tufts, 35-80 cm. tall, usually sur- 
rounded by basal leaves: leaf-sheaths usually Erw sometimes villo ous to- 
ward the summit: blades 2-5 mm. wide: panicle 10-25 em. long: spikelets 
about 2.5 mm. long: first glume not over half the e length of the spikelet. [P. 
pseudanceps Nash |—Moist acid sandy soil and low pinelands, Coastal Plain 
and New England Coast, Fla. to Tex. and R. I. 
26. P. Combsii Seribn. & Ball. Resembling P. longifolium, but usually glab- 
rous, the leaf- A shorter: lateral panicles seldom developed: spikelets 3-3.5 
mm. long, the first glume two-thirds to three fourths as long as the spikelet.— 
Wet woods, low pinelands, and cypress- pond. Coastal Plain, Fla. to La. and Ga. 
27. P. stipitatum Nash. Resembling P. agrostoides, often purple- phis 
pd pda the stem strongly eompressed: panieles usually several to a stem, 
0— lon 
10-20 e DE, T rather narro y med soil, and stream-banks, various pro- 
vinces, 8. ©. o Tex., Mo., and Con 
28. P. Pd apis MANN Plant 50—100 em. tall, with a dense clump 
Pa from a short eaudex, with numerous ape of short leaves at the base: 
stems com s sed: pane 2. em. long, the stiff branches ascending or 
aes spikelets about lon ng.—We : perit. ponds, swamps and 
marshes, various provinees, EN to Tex., Kans., dnd Me. 
29. P. ary soe ae apie e agrostoides, auy rather taller: 
n E. —25 'em. long, r wide, rather compact: spikelets 2.2- 
2.5 mm. long, turgid, the tips ml spreading. — Wet places, marshes, one 
and e Coastal Plain and nore adj. provinces, Fla. to Tex. and Pa. 
—(W. I.) 
30. P. hians Ell. Stem slender, erect or geniculate and rooting at the lower 
nodes, 20-60 cm. long: le af-blades 1-5 mm. wide: panicle 5-20 em. long, 
ds: A 
ee strongly nerved, glabrous. TOC ER s Nash]—Damp soil, low 
oods, stream-banks, pools, and ditches, Coastal Plain and adj. provinces, Fla. 
to N. M. and N. C. 
81. P. verrucosum Muhl. Plant bright-green, lax, soon decumbent, widely 
mc and divaricate- branched, as much as 150 cm. long: leaf-blades thin, 
iel 
ard —Wet 
shady places, acid swamps, ae es, and Moos Cae Plain ad. N P. v England 
Coast, Fla. to Tex. and Mass., and Great Lake Lowlands, N Ind. 
32. P. depauperatum Muhl. Stem 20-40 em. d erect oe rather stiff: leaf- 
sheaths pi Or p blades La AP A . lon mm. wide, often 
involute in drying: panicle 4-8 long, the re ae remote branches 
ascending: spikelets HR or Pa Dee Autumnal phase similar, 
