HITCHCOCK AND CHASE GRASSES OP 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 36. Panicum (p. 322). 



6. ORYZEAE. 



Spikelets unisexual; plants monoecious. 



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. 3G1). 

 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. 367). 

 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). 



