20 
flexuous; spikelets mostly in 3 rows, nearly 2lines long, broadly oval, obtuse; empty 
glumes smooth, 3- to5-nerved. In the type the leaves and sheaths are villous.—North 
Carolina to Texas and Arkansas. 
Var, GLABRATUM Engelm. Leaves and sheaths smooth; same range. 
27. P. giganteum Baldw.in Bull. Torr. Club, xu. 166. Culms 4 to 6 feet high, 
erect, stout; leaves 1 to 2 feet long, three-fourths to 1 inch wide, smooth or sparsely 
pubescent; spikes 3 to 4, 5 to 8 inches long, spreading and becoming reflexed, in two 
or three rows; spikelets rarely 2 lines long, oval, smooth; empty glumes 3- to 5- 
nerved.—Florida (A. H. Curtiss, Dr. Baldwin). 
Perhaps a large variety of the preceding. 
(d) Spikes more numerous, 20 or more, 
28. P. virgatum L. var. PUBIFLORUM Vasey. Culms to 5 feet high, stout, smooth, 
simple; leaves 1 to 14 feet long, 3 to 4 lines wide, smooth, margins scabrous; sheaths 
shorter than the internodes (6 to 10 inches long), smooth, ligule short, ciliate; 
panicle 6 to 9 inches long, of twenty or more appressed spikes, mostly alternate or 
some of the lower fasciculate in twos or threes, the lower 3 inches long, rather lax, 
gradually diminishing upward, crowded near the top; spikelets 1 to 1} lines long, 
compressed ovate, acute, pubescent, and hairy on the margins, in thre or four rows; 
empty glumes acute, 3-nerved, a little longer thar the fertile glume,—Texas (G. C. 
Nealley) and Louisiana (4. B. Langlois). 
ANTHAINANTIA Beauv. 
Spikelets loosely racemose on the slender erect branches of the lax, 
contracted panicle, containing one perfect terminal flower and one 
male or neuter one; the outer, empty glumes, hairy, 5-nerved, equal, as 
long as or longer than the flower; perfect flower, with rigid, mem- 
branaceous glume and palet (the apex soft), the sterile flower of a thin 
membranaceous palet. 
1. A. villosa Benth. (Aularanthus ciliatus Ell,; Panicum ignoratum Kth.: Chapm. 
Fl. §. States, p. 577.) Culms erect, simple, smooth, 2 to 3 feet high; leaves linear- 
lanceolate, pointed, strongly nerved, fringed on the margins, the lower ones widely 
speading; panicle racemose; spikelets 2 lines long, obovate; sterile flower with 3 
stamens; anthers and stigmas yellow.—F lorida, North Carolina to Texas, 
2. A. rufa Benth. (Aulaxanthus rufus Ell.; Panicum rufum Kth.: Chapm. FL. S. 
States, p.577.) Culms erect, 2 to 3 feet high, smooth; leaves erect, linear-lanceolate, 
the lower erect, 1 to 2 feet long; sterile flower neutral; anthers and stigmas purple, 
otherwise like the preceding; leaves and spikelets often purplish.—Florida to Louisi- 
ana and Mississippi. 
AMPHICARFPUM Kth. 
Spikelets of two kinds, those of the simple terminal panicle generally 
perfect, but infertile; the fertile ones borne singly at the ends of sub- 
terranean runner-like pedicels, these much larger than the others. The 
spikelets 1-flowered ; those of the panicle with two nearly equal, smooth, | 
pointed, membranaceous, 5-nerved outer glumes; the flowering glume 
and palet rigid membranaceous, nearly as long as the outer glumes; 
the spikelets of the runners with thickened, many-nerved, outer glumes, 
and the flowering glume and palet indurated. 
1, A. Purshii Kth. (Gray’s Manual, 6th ed., p. 634.) (Milium amphicarpum Pursh.) 
Culms, tufted, erect from fibrous roots, naked above; leaves lanceolate, mostly near 
the base, rather thin, and with the sheaths clothed with rigid spreading hairs; panicle 
