146 NORTH AMERICAN FLORA (VorLuME 17 
Fruiting scale membranous, not en- 
closing the palet above. 60. HYMENACHNE. 
Outer scales equal, entirely enclosing 
the dorsally compressed spikelet. 61. HOMOLEFPIS, 
Second and third scales leathery; first 
scale with the margins united below, 
adnate to the stipe-like internode. 62, SCUTACHNE. 
Perfect flowers 2, 63. ISACHNE. 
Spikelets with 1 or more of the outer scales awned, or if merely 
pointed, then the palet of the fruiting scale free. 
First scale of the spikelet without a distinct callus. 
Spikelets pubescent with long silky hairs, the first scale 
minute and distant from the others. 67. TRICHOLAENA. 
Spikelets otherwise. 
Third scale with the longest awn, the awns of the second 
and first successively shorter; fertile palet free at tip. 65. ECHINOCHLOA. 
Third scale with the shortest awn or awnless, the awns 
of the second and first successively longer; fertile 
palet not free at tip. 64. OPLISMENUS. 
First scale with a distinct callus. 
Callus pedicel-like. 66. CHAETIUM. 
Callus ring-like. 49. ERIOCHLOA. 
Spikelets not naked. 
Spikelets or some of them subtended by 1 or more bristles. 
Bristles persistent. 
Spikelets deciduous. 
Bristles barbed ; palet of the third scale not enlarged at 
maturity. . 
Second and third scales many-nerved, broad, the for- 
mer saccate and auriculate, the latter lyre-shaped. 68. SETARIOPSIS. 
Second and third scales not as above. 69. CHAETOCHLOA. 
Bristles smooth, sticky; palet of the third scale winged 
at maturity. : 70. IXOPHORUS. 
Spikelets persistent. 71. PENNISETUM. 
Bristles deciduous, attached to the spikelets. 
Bristles numerous. 
Bristles delicate, not thickened at the base, often plumose. 71. PENNISETUM. 
72 
Bristles rigid, thickened at the base. . CENCHROPSIS. 
Bristle 1. 73. PARATHERIA. 
Spikelets enclosed in an involucre of 2 valves which is deciduous 
with them. 74, CENCHRUS. 
Spikelets sunken in the thickened rachis of a flat spike. 75, STENOTAPHRUM. 
Spikelets of 2 kinds. 
Spikelets perfect, aerial and subterranean, the latter on short branches 
and perfecting fruit, the former usually sterile. 76, AMPHICARPON. 
Spikelets unisexual; plants monoecious. 
Stems of 1 kind, leafy. 
Inflorescence terminal on the stem or leafy branches, bearing the 
pistillate spikeletsin the upper, the staminate in the lower portions. 77. OLYRA. 
Inflorescence axillary, or if a terminal panicle is present it is always 
staminate. 
Fruiting scale laterally compressed, gibbous above. 78. LITHACHNE. 
Fruiting scale dorsally compressed, lanceolate. 79. RADDIA. 
Stems of 2 kinds, one leafy and sterile, the other leafless and bearing 
2 digitate slender racemes, one staminate, the other pistillate. 80. MNIOCHLOA. 
41. LEPTOCORYPHIUM Nees, Agrost. Bras. 83. 1829. 
Erect perennial grasses with numerous spikelets arranged in a narrow contracted panicle. . 
Spikelets articulated to the pedicel below the scales, 1-flowered, lanceolate. Scales 3 (the first 
wanting); outer 2 empty, clothed externally with long hairs, the second shorter than the 
third; fourth or fruiting scale about equaling the third scale, minutely papillose, not indurated 
when mature, chestnut, with the summit delicate and hyaline, lacerate or sometimes ciliate, 
the white flat margins hyaline down to about the middle, bearing in its axil a palet, similar in 
texture to the scale, with a free apex, and enclosing a perfect flower. 
Type species, Lepiocoryphium lanatum Nees. 
1. Leptocoryphium lanatum (H.B.K.) Nees, Agrost. 
Bras. 84. 1829. 
Paspalum lanatum H.B.K. Nov. Gen. & Sp. 1:94. 1815. 
Milium lanatum R. & §. Syst. Veg. 2: 322, 1817. 
Anthaenanta lanata Benth. Jour. Linn. Soc. 19: 39. 1881. 
