MANUAL OF THE GRASSES OF THE WEST INDIES 9 
Spikelets 2 or more in a cluster, falling together. 
Glumes smooth, connate at base, forming a pitcher-shaped false involucre. 
. ANTHEPHORA (p. 98). 
Glumes covered with hooked spines, forming little burs, not connate. 
Traaus (p. 101). 
TRIBE 7. CHLORIDEAE 
Spikelets 1- to several-flowered, in two rows on one side of a con- 
tinuous rachis, forming one-sided spikes or spikelike racemes, these 
solitary, digitate, or racemose along the main axis. 
Plants monoecious or dioecious; pistillate spikelets many-awned; staminate 
spikelets awnless; plant stoloniferous_____.___.____--- 5 OPRIz1A Go. 140): 
Plants with perfect spikelets. 
Spike solitary (rarely 2 or 3 in Saugetia) terminating the culm. 
Spikelets with 1 perfect long-awned floret_________ 53. SAuUGETIA (p. 121). 
Spikelets with several perfect short-awned florets__46. TRIPpoGoNn (p 110). 
Spikelets awmless 2-2 (o Soe aes apps yd ng Deheys 47, LEPTURIDIUM (p. 111). 
Spikes 2 or more on each culm. 
Spikes racemosely arranged. 
Spikelets articulate below the glumes, 1-flowered; maritime grasses with 
SLOUGH RIIZ OMS se ee ree fae ais ee 51. SPARTINA (p. 116). 
Spikelets articulate above the glumes, 2-to several-flowered (the second 
floret rudimentary in Bouteloua). 
Spikes short and relatively broad; upper floret often reduced to the awns. 
BovuTELOUA (p. 137). 
Spikes Jong and slender; perfect florets 2 or more. 
Lemmas awnless or with minute awns, the upper floret reduced to an 
awnless small lemma____._________- 44, LeEpPTocHLoaA (p. 102). 
Lemmas with awns as long as the body, the upper floret reduced to a 
SIEM Cle UW Minos bois BS Penner hg Phe he ay 45. GoOvuINIA (p. 108). 
Spikes digitate or nearly so. 
Spikelets with 2 or more perfect florets. 
Rachis not extending beyond the spikelets__.__48. ELEusInEe (p. 113). 
Rachis extending beyond the spikelets_49. DacryLocTENtIvuM (p. 118). 
Spikelets with 1 perfect floret only. 
Sterile floret wanting; lemma obtuse________~- 50. CyYNOoDON (p. 116). 
Sterile floret present; lemma awned or mucronate. 
Fertile floret raised on a long stipe; sterile florets reduced to long awns. 
52. GYMNOPOGON (p. 118). 
Fertile floret not raised on a stipe; sterile florets consisting of evident 
lemmas. 
Fertile Jemma 1l-awned or awnless________- 54. CHLoRIs (p. 124). 
Rertile lemma, 3-awned -_- 2-225) 22 55. TRICHLORIS (p. 134). 
TRIBE 8 PHALARIDEAE 
Spikelets with one perfect terminal floret and, below this, a pair of 
staminate or neuter florets (one sometimes obsolete in Phalaris). 
Spikelets not compressed; sterile florets exceeding the fertile floret, awned. 
58. ANTHOXANTHUM (p. 142). 
Spikelets strongly compressed, the glumes keeled; sterile florets reduced to 
small scales adnate to the fertile floret__._.___-__-_- 59. PHALARIS (p. 142). 
TRIBE 9. ORYZEAE 
Spikelets 1-flowered, perfect, strongly laterally compressed, pan- 
iculate; glumes reduced or wanting; palea apparently 1-nerved; 
stamens 6. 
Glumes present; lemmas usually awned_____-__---------- 60. Oryza (p. 144). 
Glumes wanting; lemmas awnless______________-------- 61. LeeErstra (p. 147). 
