28 
inches long; rachis hairy; spikelets in pairs or in small clusters, 1} lines long, 
acutish, lower glume about one-third as long as the spikelet, deltoid, second and third 
glumes 5- to 7-nerved, and cross-nerved.—Texas. 
Var. MAJOR. Culmsstouter, 2 to3 feet high; branched; sheaths and leaves scabrous- 
punctulate or smoothish, leaves broader, acuminate; panicle fuller, 3 to 6 inches 
long, branches more numerous (up to 20 or 30), scattered and fasciculate; rachis and 
branches scabrous, and with scattered hairs. 
Var. FASCICULATUM (P. fasciculatum Swartz). Leaves longer and wider (8 to 10 
lines wide), panicle 4 to 5 inches long, the branches very numerous, spikelets be- 
coming dark brown.—Southern Florida. 
21. P. grossarium Linn. Amoen. V. p. 392. 
Specimens from ballast ground at Philadelphia have been referred to this species, 
but if correct it seems too near P. fuscum. 
§6. PoLYSTACHY Benth. 
Small forms P. anceps might come in this group. 
22, P. barbinode Trin. (PARA Grass). (Icon. xxvit. t. 318), (P. molle Swartz). 
Culms 2 to 6 feet high, stout, ascending; nodes villous; leaves linear-acuminate, 
glabrescent; panicle lax, 6 to8 inches long; branches mostly simple, fascicled, spread- 
ing, about 2 inches long, somewhat distant; spikelets 1 to 14 lines long, glabrous, 
one-sided, spreading; lowest glume deltoid, one-fourth as long as the spikelet, L- 
nerved, second and third equaling the spikelet, 5-nerved; fertile flower ellipsoidal, 
bluntish.—Introduced and cultivated in the South. 
23. P. gymnocarpon Ell. (Chapm. FI. 8. States, p. 573.)—Perennial. Culms 2 to 
4 feet high, erect, rigid, smooth; leaves lanceolate, smooth, 1 foot long or more, 1 
inch or more wide, cordate at base; sheaths shorter than the internodes, striate, nodes 
black; panicle large, 9 to 15 inches long, branches 4 to 6 inches long, erect-spread- 
ing, scattered or 2 to 3 together, racemose; spikelets in nearly sessile clusters of 3 
to 6, appressed along the branches, somewhat one sided, 24 to 3 lines long, lanceo- 
late; outer glumes nearly alike, lanceolate-subulate, rough-keeled, 2 to 3 times longer 
than the perfect flower; first glume 3-nerved, a little to one-third shorter than the 
second and third about 5-nerved ; the third glume or neutral flower with a palet one- 
half as long.—Florida to Texas, 
24. P. repens Lim, (Chapm. Fl. 8. States, suppl., p. 666.) Culms 14 to 2 feet 
high, from strong creeping rhizomes, leafy, covered below with loose sheath with short 
or deticient blades, the blades becoming longer upward, conduplicate or involute, the 
uppermost 3 to 4 inches long, sometimes pubescent at the base; panicle erect, thin, 
3 to 4 inches long; the branches alternate, naked at base, erect or slightly spreading, 
the lower ones each with 2 or 3 rather long, appressed branchlets, short-pediceled 
and appressed, interrupted or racemose along the slender branches, 1 line long, oval, 
acute, smooth; the lower glume broad, obtuse, one-third as long as the spikelet, 
second and third about 7-nerved.—Sandy shores of the Gulf, Florida to Texas. 
Var. CONFERTUM Vasey, Culms shorter, leates very divergent and rigid, panicle 
more condensed, the branches shorter and spikelets more crowded, lower glume 
rather longer and less obtuse.—Mobile, Ala., to Vera Cruz, Mex. (2177 F. Muller.) 
P. anceps Michx. See No. 55, 
25, P. laxum Swartz. (Griseb. Fl. W. Indies, p. 548), of this group, common in the 
West Indies, is probably also in southern Florida, but I have seen no authentic speci- 
mens. 
26. P. hians Ell. (Chapm. Fl. 8. States, p. 573.) Perennial. Culms slender, 
smooth, 6 to 18 inches high, simple, from slender, wiry, creeping root-stocks; leaves 
linear, 3 to 5 inches long, 1 to 2 lines wide, smooth, erect; panicle rather small, 3 to 
5 inches long, the slender, racemose branches 1 to 2 inches long, erect-spreading, 
mostly single and distant, the lower third naked; spikelets about 1 line long, in 
small, nearly sessile, approximate clusters; outer glumes ovate, acute, generally 3- 
