144 NORTH AMERICAN FLORA [Volume 17 
1. Arthropogon stipitatus Hack. Sitz.-ber. Acad. 
Wien 89°: 125. 1884. 
Entire plant glabrous, with the exception of the callus of the spikelet. Stems about 2 dm. 
tall, robust, sheathed, simple, erect, tufted; leaves crowded near the base of the stem and of 
the innovations; sheaths round, striate; ligule very short, truncate, lacinulate; blades linear, 
somewhat acute, 5-6 cm. long, 3-4 mm. wide, flat, or when dry somewhat complanate, rigid, 
green, somewhat broadly white-lined above along the midnerve; panicle obovate, rather lax, 
erect, 6 em. long, the branches in 2’s—4’s, spreading, barbed in the axils, somewhat unequal, 
the lower about 3 cm. long, naked up to the middle, bearing 3 or 4 spikelets; spikelets shortly 
pedicelled, contracted at the base into a spike-like callus 2.5 mm. long which is furnished at 
the base with a tuft of very short hairs, 5 mm. long excluding the callus and awn, linear-oblong, 
green and flushed with violet, the first scale a little removed from the others, subulate, very 
gradually narrowed into a scabrous straight spreading awn, 18 mm. long including the awn, 
the second scale a little exceeding the first, exclusive of the awn, narrowly lanceolate, acute, 
coriaceo-herbaceous, keeled, 3-nerved, the lateral nerves approximate to the margin, very sca- 
brous on the back, terminating in a very scabrous awn equaling that of the first scale, the third 
scale a little shorter than the second, empty, membranous below, subherbaceous above, 
lanceolate, acute, entire, muticous, scabro-punctate on the back, subcarinate, the fourth scale 
equaling the second, membranous, linear-lanceolate, very acute, muticous, 3-nerved, keeled, 
glabrous, the fifth (palet?) half as long as the fourth, linear-lanceolate, nerveless, glabrous. 
TYPE LOCALITY: Cuba. 
DISTRIBUTION: Known only from the type locality. Material of this has not been examined, 
and the above is drawn from the original description. 
Tribe 5. PANICEAE. Annual or perennial grasses, with a _ spicate, 
racemose, or paniculate inflorescence, the spikelets naked, or enclosed in or 
sutrounded by an involucre, consisting of numerous bristles or spines, or of 2 
spiny valves, the involucre persistent or falling with and attached to the spike- 
lets, or the spikelets rarely imbedded in a thick rachis. Spikelets articulated 
below the empty scales or the subtending involucre, 1- or 2-flowered, one flower 
in the axil of the terminal scale, perfect, the other, when present, in the axil 
of the next scale, staminate, or rarely perfect. Scales awnless, rarely awned, 
normally 4, or 2 or 3 by the suppression of the first and second scales, all but 
the innermost scale membranous or herbaceous, rarely delicate and hyaline, 
differing in texture and appearance from the fruiting scale and thinner than it, 
or rarely the third scale resembling the fourth; first scale usually small or 
rudimentary, rarely equaling the others, often wanting; second and third 
scales often as long as the spikelet, the second rarely wanting, the third some- 
times enclosing a staminate, rarely a perfect, flower and a palet; fourth or 
fruiting scale papery, cartilaginous, or hard and bony, varying much in 
shape, the margins flat and often hyaline, or inrolled, enclosing a palet of 
similar texture and a perfect flower. Caryopsis with a punctiform hilum. 
Spikelets of one kind, hermaphrodite. 
Spikelets not sunken in cavities in the rachis, or if so, the rachis not thickened. 
Spikelets naked, not subtended by bristles, nor enclosed in an involucre ; apex of the panicle- 
branches and branchlets sometimes terminating in a bristle. 
Spikelets with the outer scales awnless. 
Spikelets of 2 scales, the first and second wanting. 
Fruiting scale long-acuminate, not indurated. 53. REIMAROCHLOA. 
Fruiting scale not long-acuminate, indurated. 54, PASPALUM. 
Spikelets of 3 or 4 scales. 
Perfect flower 1. 
Fruiting scale not rigid, often dark-colored, papillose, the 
white hyaline margins not inrolled. 
