35 
long, the outer glumes papillose-hispid, the lower one minute, acutish.—South Caro- 
lina to Texas, 
56. P. anceps Michx. (Gray’s Manual, 6th ed., p.631.) Culms flattened, erect, 2to3 
feet high, less stout than in P. agrostoides, from strong creeping root-stocks; leaves 
rather broadly linear, a foot or more long, 4 to 5 lines wide, smooth or the lower 
ones with the sheaths pubescent; panicles contracted, lateral and terminal, 6 to 12 
inches long, the branches from single to verticillate, rather distant, particularly 
below, generally very abundantly flowered ; spikelets 1 to 14 lines long, ovate-lan- 
ceolate, pointed, the apex a little curved; lower glume about one-balf as long as the 
spikelet; upper glume 5- to 7-nerved. 
Var, PUBESCENS, Leaves and sheaths more or less pubescent; panicle and branches 
slender; spikelets ovate lanceolate, acute, little more than 1 line long.—Mobile, Ala. 
(Dr. Mohr). ; ; 
Var. ANGUSTA. Lower sheaths villose; leaves very long and narrow, erect, rigid; 
spikelets narrowly lanceolate, acuminate, 1} lines long, the lower glume one-third 
as long as the spikelet.—Texas. (G@. C. Nealley.) 
Var. DENSIFLORUM. Leaves broad; panicle glomerate and interrupted, the branches 
densely flowered ; spikelets lanceolate, 14 lines long.—Texas (J. F. Riggs). 
57. P. agrostoides Spreng. (Gray’s Manual, 6th ed., p. 631.) Culms flattened, 
erect, stout, 2 to 4 feet high, usually in thick clumps, glabrous, much branched above, 
the branches erect; leaves linear, 1 to 2 feet long, 3 to4 lines wide, smooth as also the 
compressed sbeaths; panicles terminal and lateral, 4 to 12 inches long, oblong, be- 
coming pyramidal, very full, the lower branches 2 to 3 inches long, much subdivided 
to the base; spikelets racemose, very short pediceled, crowded and mostly one-sided 
on the branches, ovate-oblong to lanceolate, ? to 14 lines long; lower glumes acute or 
acutish, half as long as the spikelet; second and third glumes 5-nerved, half longer 
than the perfect flower, the latter slightly bearded at the apex.—In wet ground. 
Varies in the size and form of the spikelets, which in the Western form seldom 
exceed a line long; there isan Eastern form in which the spikelets are lanceolate, 
about 14 lines Jong, and the perfect flower small and conspicuously stalked. 
58. P. bulbosum H. B. K. Nov. Gen. I. p.99. Rhizoma creeping, thick, bulbous; 
culms 4 to 5 feet high, smooth, stout, with long internodes; leaves long and nar- 
row (1 to 2 feet by 2 to 4 lines), smooth, or the lower ciliate below; panicle 
about 1 foot long, spreading, copious, pale green; branches scattered and verticillate, 
the lower 4 to 5 inches long, much subdivided nearly to the base, branchlets slender 
and numerously flowered ; spikelets sometimes in pairs or racemose, 1} lines long, 
smooth, obtuse or acutish, not acuminate; lower glume half or rather more than half 
as long as the spikelet, broad, three-nerved, acutish; second and third glumes equal, 
5-nerved, the third with a narrow palet; pertect flower as long as the spikelet, 
oblong, lanceolate, abruptly acute, the point sometimes a little roughened,—Texas, 
New Mexico and Arizona. ' 
Var. MINOR (P. maximum, var. bulbosum Munro). A smaller form, about 2 feet 
high, with the panicle much reduced.—In same region, 
Probably P. avenaceum Kth. is not different, 
o9. P. maximum Jacq. Coll. I. p. 76. (P. jumentorum Pers.) Culms erect, 3 to 5 
feet high, glabrous; nodes softly pubescent; leaves iinear, 1 to 14 feet long, 9 to 
12 lines wide, rather rigid, margin scabrous; sheaths smooth; panicle 14 feet long, 
much branched, hispid or scabrous, the branches verticillate, long and contracted, 
racemose, scabrous; spikelets mostly short-pediceled, 14 lines long, ovate, smooth, 
acute; lower glumes about one-third as long as the spikelets; second glume shorter 
than the spikelet ; perfect flower acute.—Introduced and cultivated in the South, 
60. P. amarum Ell. (Gray’s Manual, 6th ed., p. 631.) Culms» to3 feet high, froma 
stout running root stock, thick, columnar. nearly one-half inch in diameter; leaves 
nearly flat, almost coriaceous, glaucous, | to 1} feet long, 4 to 6 lines wide, tapering 
