HITCHCOCK AND CHASE—GRASSES OF THE WEST INDIES. 269 
Inflorescence an open or contracted panicle or, if 
somewhat spikelike, the fruit not stipitate nor the 
second glume saccate; fertile lemma chartaceous- 
indurate. 
Culms woody, bamboo-like; spikelets globose, large; 
fertile lemma and palea bony-indurate, a downy 
tuft at the apex_________ 38. Lasiacis (p. 335). 
Culms not woody nor bamboo-like. 
Fertile lemma either with lateral appendages or 
excavations at the base, the margins usually 
not inrolled_______ 37. Ichnanthus (p. 333). 
Fertile lemma with neither lateral appendages 
nor excavations at base, the inrolled margins 
clasping the palea____836. Panicum (p. 322). 
6. ORYZEAE. 
Spikelets unisexual; plants monececious. 
Pistillate lemma cylindric, beaked; glumes present; blades broad, elliptic or 
oblanceolate-oblong_____ -- — 56. Pharus (p. 360). 
Pistillate lemma subglobose; glumes wanting; blades narrowly linear, 
57. Luziola (p. 361). 
Spikelets perfect. 
Inflorescence a terminal spike; spikelets with long coiled tendril-like awns 
entangled at the summit of the axis_____ 61. Streptochaeta (p. 364). 
Inflorescence an open or contracted panicle; awns if present not coiled. 
Glumes awned, about as long as the lemma____60. Reynaudia (p. 363). 
Glumes awnless, much shorter than the lemma or wanting. 
Glumes wanting; lemmas awnless__59. Homalocenchrus (p. 362). 
Glumes present; lemmas usually awned___-_-_ 58. Oryza (p. 362). 
7. PHALARIDEAE. 
Spikelets strongly compressed, the glumes keeled; sterile florets reduced to 
small scales adnate to the fertile floret-___.______ 62. Phalaris (p. 364). 
Spikelets not compressed ; sterile florets exceeding the fertile floret, awned. 
63. Anthoxanthum (p. 364). 
8. AGROSTIDEAE. 
Lemmas awned. 
Awn trifid (lateral awns rarely minute)_--._________64. Aristida (p. 364). 
Awn simple. 
Glumes awnless; panicle diffuse__._.-______ 65. Muhlenbergia (p. 367). 
Glumes awned; panicle contracted__-----____- 68. Polypogon (p. 370). 
Lemmas awnless. 
Inflorescence a cylindric spikelike panicle; glumes abruptly mucronate. 
66. Phleum (p. 867). 
Inflorescence an open or contracted panicle; glumes not abruptly mucronate. 
Glumes not longer than the floret, usually much shorter. 
67. Sporobolus (p. 367). 
Glumes longer than the floret _.69. Agrostis (p. 371). 
