MANUAL OF THE GRASSES OF THE WEST INDIES iE 
Bristles numerous below each spikelet or cluster of spikelets. 
Bristles not united at base, usually slender, often plumose. 
PENNISETUM (p. 355).. 
Bristles more or less united at the base, forming a bur. 
95. CENCHRUS (p. 360). 
Spikelets not subtended nor surrounded by bristles. 
Fruit cartilaginous-indurate or (Triscenia) merely somewhat chartaceous, 
not rigid, papillose, usually dark colored, the lemma with white 
hyaline margins, these not inrolled. 
Fruit open at the hyaline summit; inflorescence a narrow grayish silky 
PANIC LIEK TI ee OO ie Deets 69. LEPTOCORYPHIUM (p. 163). 
Fruit not open at the summit; inflorescence a narrow panicle or usually 
of slender racemes. 
Inflorescence a narrow few-flowered panicle; first glume half as long 
assure spikelet, acute: 2222 22252 68. TRIScENTA (p. 161). 
Inflorescence 1 to many spikelike racemes. 
Spikelets conspicuously long-silky; fruit lanceolate-acuminate; 
racemes in a flabellate panicle_____ 70. TRICHACHNE (p. 163). 
Spikelets with short pubescence or glabrous; fruit elliptic; racemes 
digitate or subdigitate_____.____-___- 71. Direrrarta (p. 167). 
Fruit indurate, rigid (or if thin not hyaline-margined). 
Sterile lemma splitting down the middle, the halves inrolled, appear- 
ing like two glumes side by side; raceme solitary, the rachis broad- 
VAN CL Lene seen aney ok ree READ Se (Gy hss (Os Ue 
Sterile lemma, not splitting. 
Spikelets solitary, subsessile, placed with the back of the fruit turned 
away from the rachis. 
Inflorescence a solitary erect spikelike raceme, the spikelets 
e swollen on the side toward the rachis and fitting into alter- 
matevhollowsios7: Sani ae ae 74. MrsosEetTumM (p. 180). 
Inflorescence of 2 to many racemes or paniculate. 
Rachilla joint and first glume forming a swollen ringlike callus 
at the base of the spikelet; inflorescence paniculate. 
75. ERIOCHLOA (p. 182). 
Rachilla joint and first glume not forming a callus at the base of 
the spikelet; inflorescence racemose. 
Racemes racemose along the main axis; first glume present. 
, 76. BRACHTARIA (p. 185). 
Racemes aggregated at the summit of the culm; first glume 
TV DUMU TWA yer ocala aon Yt Splat 77. AXONOPUS (p. 187). 
Spikelets in twos or threes or solitary, placed with the back of the 
fruit turned toward the rachis or pedicellate in panicles. 
Fruit long-acuminate, scarcely indurate, both glumes wanting; 
spikelet sessile, solitary, the stiff racemes horizontal or reflexed 
RORIMMAGIEEG yee 78. REIMAROCHLOA (p. 191). 
Fruit not long-acuminate, indurate (if but slightly indurate both 
glumes present). 
First glume typically wanting; spikelets planoconvex, sub- 
sessile in spikelike racemes_______- 79. PaSPALuM (p. 198). 
First glume present; spikelets usually in panicles, biconvex to 
globose. 
Glumes or lemmas or both awned or, if short-pointed only, 
the summit of the fertile palea not enclosed and the 
spikelets crowded in short racemes. 
Inflorescence of i-sided racemes along a common axis; 
glumes 2-lobed (rarely entire), awned from between 
the lobes; fruit indurate, the palea enclosed at the 
SUM ses Bea Bean 87. OPLISMENUS (p. 320). 
Inflorescence paniculate. 
Spikelets long-silky; first glume minute, remote. 
90. TRICHOLAENA (p. 331) 
Spikelets not silky, often scabrous or hispid. 
Spikelets with a long-pointed callus at the base. 
89. CHAETIUM (p. 331). 
Spikelets without a callus_88. EcHINOCHLOA (p. 325)- 
